Freshwater Sentence Examples
On the Llano Estacado there are both freshwater and salt lakes, and there are a few salt lakes in the Trans-Pecos Province and near the mouth of the Rio Grande on the Coastal Plain.
The very large assemblage of forms coming under this order comprises the most highly developed predaceous sea-snails, numerous vegetarian species, a considerable number of freshwater and some terrestrial forms. The partial dissection of a male specimen of the common periwinkle, Littorina littoralis, drawn in fig.
A very fine freshwater fish is the Murray cod, which sometimes weighs Too lb; and the golden perch, found in the same river, has rare beauty of colour.
Several of the marine and many species of freshwater algae are peculiar to the island.
Upon these rest patches of freshwater deposits containing numerous remains of plants.Advertisement
In freshwater lakes and ponds, especially if the water is stagnant, aquatic plants are abundant.
They consist chiefly of sands and clays of aeolian and freshwater origin.
Of the twenty-one species of freshwater fish, five are peculiar to the country, but none is of much economic value save the barbel and eel.
But for a long period past the freshwater streams (which predominate) have been used for irrigation to such a degree that very little of the precious water is allowed to run to waste into the lake basins; so that these latter receive only a few salt streams, which deposit on their surface the salt they contain and then evaporate.
Freshwater fish, consisting mostly of catfish, buffalo fish, bass, sunfish and drum, are common in the lower courses of the rivers.Advertisement
Texas has no large lakes; but freshwater lakes, which are fed either by streams or springs, are common on the Coastal Plain; the best known of them are Grand Lake in Colorado county, Clear Lake in Harris county, and Caddo Lake on the Louisiana border.
The records of the wars in Ireland in the r6th century show that the petty chieftains of that time had their defensive strongholds constructed in the "freshwater lochs" of the country, and there is record evidence of a similar system in the western parts of Scotland.
One species, however, Distira semperi, is confined to the landlocked freshwater Lake Taal at Luzon in the Philippines.
Chlorophyceae include both marine and freshwater plants.
A wide gap separates Archaeopteryx from the next order of fossil birds of the Cretaceous epoch, and, since freshwater deposits of that age are rare, bird remains are uncommon.Advertisement
Japanese rivers and lakes are the habitation of severalseven or eightspecies of freshwater crab (kani), which live in holes on the shore and emerge in the day-time, often moving to considerable distances from their homes.
Elsewhere the plants generally indicate a higher horizon and are considered to correspond with the Rhaetic of Europe_ Jurassic beds are known only in the Cordillera itself, and the Cretaceous beds, which occur in the west of the country, are of freshwater origin.
In some families, as many freshwater snakes, the sea snakes, Viperinae and Crotalinae, the eggs are retained in the oviduct until the embryo is fully developed.
He was the author of the De mensura orbis terrae, finished in 825, which contains the earliest clear notice of a European discovery of and settlement in Iceland and the most definite Western reference to the old freshwater canal between the Nile and the Red Sea, finally blocked up in 767.
The portion known as Freshwater Gate fronts the English Channel from the strip of low-lying coast interposed between the cliffs of the peninsula and those of the main part of the island.Advertisement
For the study of freshwater Entomostraca large possibilities are now opened to the naturalist.
At the present time it represents an intermingling of marine and freshwater forms. To the former belongs the herring (Clupea), and to the latter, species of Cyprinus, Perca and Silurus, also a lobster.
The valley, which extends from the borders of Sussex to Hythe, is occupied chiefly by the Weald clays, which contain a considerable number of marine and freshwater fossils.
Morton Park contains 200 acres of woodland bordering the shores of Billington Sea (a freshwater lake).
Cyrenellidae.-Two elongated, united, non-retractile siphons; freshwater.Advertisement
Mutelidae.-Differs from Unionidae in having two pallial sutures; freshwater.
Aetheriidae.-Shell irregular, generally fixed in the adult; foot absent; freshwater.
Conjugatae, Protococcales and Characeae are exclusively freshwater; Confervales and Siphonales are both freshwater and marine, but the latter group attains its greatest development in the sea.
Thorea, Lemanea, Tuomeya, Stenocladia, Batrachospermum, Balbiania are genera belonging entirely to fresh water; and Bangia, Chantransia, Caloglossa, Bostrychia and Delesseria contain each one or more freshwater species.
In the case of the freshwater algae, however, belonging to the Chlorophyceae and Cyanophyceae, although they required to be immersed during the vegetative period, the reproductive cells are often capable of resisting a considerable degree of desiccation, and in this condition are dispersed through great distances by various agencies.
The great majority of the aquatic algae, both freshwater and marine, are attached plants.
To the aggregate of such forms, both animal and vegetable, the term plankton has been applied, and the investigation of the vegetable plankton, both freshwater and marine, has been pursued in recent times with energy and success.
The German Plankton Expedition of 1889 added greatly to our knowledge of the floating vegetable life of the North Atlantic Ocean, while many laboratories established on the shores of inland seas and lakes have rendered a similar service in the case of our freshwater phyto-plankton.
The families Diatomaceae, Peridiniaceae and Protococcaceae are best represented in the pelagic plankton, while in addition the Volvocaceae are an important element in freshwater plankton.
The presence of tannin has been established in the case of a great number of freshwater algae.
In the case of the freshwater species the host-plants are mostly species of aquatic Graminaceae, Naiadaceae or Nymphaeaceae.
The Characeae among freshwater algae and the Sargassaceae among marine algae might be cited as examples.
The occurrence of a plentiful mucilage in many freshwater forms is, however, doubtless a provision against desiccation on exposure.
They consist of marine beds alternating with freshwater and littoral deposits, together with plant beds and coal-seams of considerable thickness.
The lower part of the Miocene is marine in Herat and Afghan Turkestan; but the upper Miocene is usually of freshwater or estuarine origin.
The Pliocene consists entirely of freshwater and terrestrial deposits, which were probably laid down at the foot of the rising hills and on the floors of the intervening valleys.
It is not unlikely that such changes have in past time occurred; and if so an explanation is afforded of the occurrence of allied forms of freshwater dolphins (Platanista) and of many other animals in the two rivers and in the Brahmaputra.
Even if they are entirely of freshwater origin, we should expect that some traces of life from the waters or neighbouring land would be found.
The beds are almost entirely of freshwater origin.
Freshwater oysters, which attain a large size, are also found in the rivers, particularly in the Niger.
In the central and southern portions of the plateau the streams either flow into salt lakes, where their waters pass off by evaporation, or into freshwater lakes, which have no visible outlets.
The freshwater lakes are Beishehr Geul (anc. Karalis), 3770 ft., a fine sheet of water 30 m.
Marine Eocene beds occur near the Dardanelles, but the Tertiary deposits of this part of Asia Minor are mostly freshwater and belong to the upper part of the system.
The contemporaneous beds inland are of freshwater origin.
The eastern ranges of the Bolivian Andes are formed of Palaeozoic rocks with granitic and other intrusions; the Western Cordillera consists chiefly of Jurassic and Cretaceous beds, together with the lavas and ashes of the great volcanoes; while the intervening plateau is covered by freshwater and terrestrial deposits through which rise ridges of Palaeozoic rock and of a series of red sandstones and gypsiferous marls of somewhat uncertain age (probably, in part at least, Cretaceous).
No later marine deposits have been found either in the eastern Andes or in the plains of Bolivia, but freshwater beds of Tertiary and later date occupy a wide area.
North of the morainic belt the effect of the glaciation is seen in the irregular courses of the streams, the numerous lakes and freshwater marshes and the falls and rapids along those streams displaced by the glaciers from their former courses.
The bathing is invigorating; it must be followed by a freshwater bath because of the incrustation of the body from the briny water.
Dempsey Series; freshwater beds, containing no productive coal.
In some freshwater Copepoda the secretion of the dermal glands forms a gelatinous envelope, by means of which the animals are able to survive desiccation.
Slowly this sea shallowed, giving rise to the alternating estuarine marine and freshwater deposits of the Coal Measures.
The English freshwater fisheries are not of great commercial importance, nor, from the point of view of sport, are the salmon and trout fisheries as a whole of equal importance with Fresh- those of Scotland, Ireland or Wales.
Beside these there is another group of largely freshwater species, constituting the family Platanistidae, and typified by the susu (Platanista gangetica), extensively distributed throughout nearly the whole of the river-systems of the Ganges, Brahmaputra and Indus, ascending as high as there is water enough to swim in, but never passing out to sea.
Land tortoises have also disappeared,' but one freshwater species (Sternothaerus sinuatus) is still found; and the adjacent seas contain many turtles.
Over 40 species of freshwater mussels (Unionidae) have been observed in the Rumanian rivers.
Among European freshwater fishing-grounds, the Danube is only surpassed by the Volga; the most valuable fish being sturgeon and sterlet, mostly netted in the St George mouth; carp, often weighing 50 lb; pike, perch, tench and eels.
There are not many varieties of freshwater fish, the commonest being the baba or cat-fish and the yellow fish.
Freshwater pearls are found in many of the streams; and in 1907 and 1908 Wisconsin ranked first among the states in the value of mineral waters sold, with a value of $1,526,703 in 1907 and $1,413,107 in 1908, although in both years the quantity sold in Wisconsin was less than in Minnesota or in New York.
The manioc root is also largely consumed, together with several other roots and vegetables; but little animal foods (save fish and freshwater Crustacea) is taken by the mass of the people except at festival times.
During the whole of the time - Carboniferous to Rhaetic - that this great accumulation of freshwater beds was taking place, the interior of the continent must have been undergoing depression.
The freshwater fish are reported to be of the types found in Sumatra.
At its greatest elevation it is comparatively level, and contains many extensive freshwater basins, such as Lake Augusta, Lake St Clair, Lake Sorell, Lake Echo, Lake Crescent, Arthur's Lake and the Great Lake.
It has been suggested that the admixture of large quantities of decomposed freshwater algae among the original mud is the origin of the paraffins.
It feeds on small freshwater animals and soft vegetable matter, and spawns in April or May.
Update buoyancy after heat advection and freshwater inflow, if used.
There are over 2,200 species of freshwater algae known to exist in the British Isles and there is nothing wrong with them as such.
The necklace has a mixture of stones in pale and dark amethyst with freshwater peacock pearls.
A range of information and studies are available on sea angling, freshwater angling and the social and economic value of angling in Europe.
In freshwater aquaculture, the farms achieve a mean efficiency level of 83% .
Me currently, I am trying to get my freshwater aquarium switched over to solar power.
A major groundwater aquifer, two fifths of Kuwait's entire freshwater reserve, remains contaminated to this day.
Featuring white cultured freshwater baroque pearls threaded with pink thread and a 9 carat gold clasp.
From the north end of the shingle beach head south to Torcross passing the freshwater lake in the reserve.
Freshwater Ecology (GCSE and A-Level) A number of stream sites are studied using biological, chemical and environmental sampling techniques.
Functions in relation to marine and freshwater biology, and fishery research, were passed to the Natural Environment Research Council in 1965.
This may adversely affect the freshwater biota, and the quality of private water supplies.
Over one hundred freshwater species have been recorded as being susceptible to the disease, including the African catfish.
Salmonid pellet feed consists of primarily marine-derived material and thus exhibits carbon and nitrogen stable isotopic compositions distinct to most freshwater organic material.
Broiled, to eliminate contaminants found in freshwater fish.
Freshwater crustaceans, including crayfish and some river prawns and river crabs, have local market value in many regions.
It is the only species of freshwater crayfish which is native to the UK.
A good, but very dated, general guide to freshwater life in the United States.
A dozen years ago there was a scheme to beautify and redevelop the docklands of Newport by the creation of a freshwater lake.
Other species such as rockling and freshwater eel, plus occasionally a few lesser-spotted dogfish and strap conger eel, will show.
This idea is used in freshwater ecology for instance where certain species are characteristic of organic pollution.
Research has shown that metals in the food chain are the most likely long term cause of metal accumulation by fish in freshwater ecosystems.
In contrast, freshwater eel are targeted by casting small peeler crab baits 100 yards or more into the main channel.
A handcrafted pendant made using sterling silver from Bali, freshwater pearls and precious stones of natural emerald or ruby.
Specialist areas include entomology, vertebrates and marine and freshwater biology.
The native freshwater fish fauna, totalling 17 species, is exceptionally large relative to the rest of New Zealand.
The Nile perch is the largest freshwater fish in the world accessible to anglers.
There are several freshwater lochs, some with restricted access, offering fly-fishing for brown trout.
This article will deal therefore with those types found free-living in the freshwater environment.
With its own wide, sandy beach, it also has direct frontage onto a lake fed by freshwater springs.
The outer parts of these systems are little diluted by freshwater and typically conform to Annex I type 1160 Large shallow inlets and bays.
Insects occur in all possible terrestrial habitats including freshwater, deserts and Polar Regions.
Not generally a problem in farmed fish, only wild fish as they enter freshwater to spawn.
It has a semi-aquatic lifestyle, and inhabits freshwater, either slow-running rivers or lochs.
Invasive organisms, pests and diseases threaten food and agricultural systems and critical terrestrial, freshwater and marine ecosystems and environmental services.
Nariva, the largest freshwater swamp in Trinidad, also has an excellent mangrove area.
Humans now use between 40% and 50% of all available freshwater running off the land.
Learn about all the world's oceans, as well as rainforest, tropical freshwater, seashores and beaches.
This corresponds well with the single date known from Loch Awe and in general with the dates produced from other mainland freshwater Loch bodies.
The new SSSI status is to help protect the unique freshwater mussel, which in the past produced a freshwater mussel, which in the past produced a freshwater pearl for the Queen.
The new SSSI status is to help protect the unique freshwater mussel, which in the past produced a freshwater pearl for the Queen.
In arid western China, shrinking glaciers account for at least 10 percent of freshwater supplies.
Freshwater flounders will also eat some green algae as well.
Localized freshwater influence often results in the growth of ephemeral green algae on the shore.
The fish utilize food sources naturally present in the waters, including freshwater shrimp, benthic invertebrates, snails and insects.
Do you need to record the freshwater invertebrates in the river?
This membrane confuses me, because I hear that there is no fertilization membrane in Hydrozoa, to which freshwater jellyfish belongs.
Here, the freshwater lagoon is a sanctuary for large numbers of coastal birds.
Nile perch was introduced some years ago into lake Victoria in Africa, the world's largest freshwater lake.
A pair of Mal lards were on the flooded freshwater stream that ran parallel with the river south of Cuckoo's Corner.
They are then transferred to cages floating just below the surface of a freshwater loch.
They are more valuable than freshwater pearls for their rarity and high luster.
If time permits we'll explore some freshwater marshland and orchards before returning to our hotel in the late afternoon.
To investigate the potential of marine and freshwater microbes for use in the biotechnology industry.
Pediastrum is a genus of green algae that is commonly found in many freshwater microhabitats because it has a cosmopolitan distribution.
Rare and endangered freshwater mollusks in eastern United States.
Freshwater pearl mussels prefer fast running, cool waters, low in calcium.
Higher amounts of dissolved oxygen are found in freshwater.
Our stocks of loose pearls in freshwater, cultured and south sea are one of the largest in Europe.
The succeeding unit consists of organic freshwater silt, grading upwards into fen peat.
This paper deals with the anatomy and histology of the male reproductive system of the freshwater prawn.
High water temperatures and freshwater runoff caused the coral to be bleached.
Click here for maps showing freshwater scarcity in Africa and the World at large.
Excellent for use in freshwater or marine aquariums to feed scavengers thereby reducing the chances they will attack other aquatic pets.
Freshwater - beautiful surrounding cliffs to explore the coastal scenery.
In places the lower cliffs, backshore and cliff crevices are influenced by freshwater seepages, flushes and springs.
Their main food source is freshwater shrimps, water slaters and caddis larvae which they obtain by diving and hunting underwater.
Its experimental facilities allow trapping and counting of wild salmon smolts (juveniles) migrating to sea and adults returning to freshwater to spawn.
There are 52 species of freshwater snails found in Britain.
They are obviously very flat, but do notice that the compression is different to that of a freshwater stingray, for example.
Sport & Leisure 2 freshwater swimming pools (1 heated in winter) and children's pool, outdoor Jacuzzi and table tennis.
The immediate surrounding area included terrestrial, freshwater and coastal habitats.
The deep river valleys may have silted up, leaving shallow, probably tidal, freshwater river valleys.
It's believed more than 12 million freshwater turtles a year are being sold for food in China alone, " said Rob.
For freshwater wetlands, population pressure is one of the problems.
Further facilities include a wine cellar, freshwater pools, tennis courts and viewing pavilion.
They are the most numerous organisms in freshwater zooplankton.
He then retired to Freshwater, in the Isle of Wight, and took an active interest in the affairs of the Royal Astronomical Society, of which he became honorary secretary in 1862 and president in 1866.
The remainder of the island consists chiefly of low undulating ground, a mixture of pasture and morass, with many shallow freshwater tarns, and small streams running in the valleys.
Freshwater and terrestrial deposits of Mesozoic age occur in many places, and the conclusion is irresistible that the greater part of this area has been land since the close of the Palaeozoic era.
In the same way the entire absence of any marine fossils in the peninsula of India, excepting near its borders, and the presence of the terrestrial and freshwater deposits of the Gondwana series, representing the whole of the geological scale from the top of the Carboniferous to the top of the Jurassic, show that this region also has been land since the Carboniferous period.
Other freshwater fish are the perch, black bass, pike, pickerel and white fish.
They have the same functions as the contractile vacuole of freshwater Protozoa.
The synonym "gray," given by Willughby and Ray, is doubtless derived from the general colour of the species, and has its analogue in the Icelandic Grdond, applied almost indifferently, or with some distinguishing epithet, to the female of any of the freshwater ducks, and especially to both sexes of the present, in which, as stated in the text, there is comparatively little conspicuous difference of plumage in drake and duck.
Freshwater pearl mussels need healthy salmonid populations to complete their life cycle.
Rice farmers are entirely satisfied with the freshwater they now enjoy year round.
Sport & Leisure 2 freshwater swimming pools (1 heated in winter) and children 's pool, outdoor Jacuzzi and table tennis.
Research Research in the center includes work in terrestrial, freshwater and marine systems.
It 's believed more than 12 million freshwater turtles a year are being sold for food in China alone, said Rob.
Lakes and rivers are important sources of freshwater in the earth's hydrosphere.
Pearl types include imitation, natural, freshwater, and cultured.
Freshwater pearls are a product of freshwater mussels.
Pearls.com sells a variety of pearl jewelry from cultured to freshwater pearls.
Charleston Seafood offers fresh ocean fish and shellfish as well as freshwater fish.
These are the easiest freshwater fish to keep.
Located within miles of The Outlet Shoppes is Deception Pass State Park where you can camp and enjoy freshwater and saltwater shorelines.
Place dry food and freshwater in his bowls before you retire for the night.
Farm and city runoffs create freshwater pollution that eventually finds its way to the oceans.
Freshwater pollution affects drinking and agricultural water sources and impacts fish populations.
The Mademoiselle collection offers a delicate, feminine blend of colored stones, colored sapphires, freshwater pearls, and pink, yellow, or white gold.
The colors of aquamarine, peridot, citrine, amethyst, colored sapphires, tourmalines, iolites, and creamy freshwater pearls create an interplay with gold and diamonds that offers a refreshing and feminine appeal.
Cultured freshwater pearls can be encouraged to grow in a variety of shapes, for instance hearts and crosses by placing preformed grit into the oyster.
Jewelry designer Mackenzie Miller handcrafts a beautiful mother daughter bracelet set using striking peachy pink colored freshwater pearls and round silver alphabet beads to spell out the chosen names.
Each lovely bracelet created from 12 sterling silver beads and 16 exquisite freshwater pearls holds a beautiful sterling silver engraved heart charm with a genuine solitaire diamond.
Hand constructed form turquoise, coral, Chinese porcelain, freshwater pearls, sterling silver, abalone pearl, Czech glass and Austrian crystal, these special bracelets each have half of an interlocking heart.
Pearls can be found in different qualities, ranging from the highly prized and highly valued top end pearls through to mass market freshwater pearls.
They're golden sand dollars paired with blue freshwater pearl dangles.
Prices start at approximately $40 for a chocolate colored freshwater pearl depending on your choice of metal, setting and complementary or accent stones.
The wide availability of freshwater pearls has meant that pearl jewelry is much more accessible and beautiful items of jewelry are available for a fraction of the cost of expensive Akoya or Mikimoto pearls.
This sorority Greek friendship necklace is made out of freshwater pearls and Swarovski crystals.
Freshwater pearls are considered a well-priced option.
You can purchase a strand of freshwater pearls that have been dyed a chocolate color for as little as $99.
Rice pearls are small, oval-shaped freshwater pearls.
There are several types of freshwater pearls, and each style can give you a different look.
They occur in freshwater and saltwater, and cultured varieties are harvested in saltwater.
Dyed freshwater pearl earrings are an affordable alternative to the Tahitian, with many available for fewer than $100.
Her creations contain gemstones as well as other precious stones such as freshwater pearls.
The Judith Ripka Sterling Cultured Freshwater Pearl and Gemstone Pin has simulated diamonds, garnet, amethyst and pearls set in sterling silver.
In-Fisherman Freshwater Trophies is a one player simulation fishing game with no-frills for an experienced fisherman.
Catch freshwater and saltwater fish while maneuvering around an expansive environment.
Filling the lines with antifreeze insures that even if there are trace amounts of water left in your freshwater system, it will not freeze and your plumbing will be safe and free of damage in the spring.
By removing all of the water from your RV, including freshwater and all holding tanks, you can insure that your camper will remain free of any damage in the spring, and be ready to enjoy again once camping season begins.
Many factors influence the cost of pearl hair pieces, including whether the pearls are freshwater or saltwater and real or cultured, as well as their size, color, and other accents on the hair piece.
It's Michigan's second largest freshwater lake and a favorite of vacationers and retirees.
Lake Hubbard is seven miles long by two miles wide and is the second largest freshwater lake in Michigan.
Dressy enough to wear to a black tie affair, the Pearl Charm Bracelet offers luxury and convenience in a fashionable freshwater pearl bracelet.
Freshwater pearl beads are generally made by calms or mussels in China or Japan.
Burbot, a freshwater relative of cod, are also eligible for spear fishing in certain regions of the province.
The marine facies of the later Tertiaries is confined to the neighbourhood of the coast, and was probably formed after the elevation of the Andes; but inland, freshwater deposits of this period are met with, especially in Patagonia.
Rajputana possesses no natural freshwater lakes, but there are several important artificial lakes, all of which have been constructed with the object of storing water.
Of freshwater fish the trout of the mountain streams and the eels of the coast lagoons may be mentioned.
This improvement was projected to include the damming of the Charles river, and the creation of a great freshwater basin, with drive-ways of reclaimed land along the shores, and other adornments, somewhat after the model of the Alster basins at Hamburg.
Many of the freshwater algae which form a mere crust, such as Palmella cruenta, may be placed in a vessel of water, where after a time they float like a scum, the earthy matter settling down to the bottom, and may then be mounted by slipping a piece of mica under them and allowing it to dry.
Next, proceeding from this region in an easterly direction, are the Neogene freshwater formations, filling up the greatest part of the north-east of Bosnia, as also a zone of flysch intermingled with several strips of eruptive rock.
Many Acari are parasitic on marine and freshwater molluscs, and others are found on the feathers of birds and the hair of mammals.
Freshwater scale-fish are mostly full of bones, but fine eels and barbel are plentiful in the rivers.
The Pliocene, on the other hand, is of freshwater origin, and contains silicified wood and numerous remains of Mammalia.
The Arakhtu, or " river of Babylon," flowed past the southern side of the city, and to the south-west of it on the Arabian bank lay the great inland freshwater sea of Nejef, surrounded by red sandstone cliffs of considerable height, 40 m.
The eggs are free in freshwater lakes and rivers, where they enter the bodies of pike, turbot and other fishes, and are thus eaten by man.
Sea-snakes shed their skin frequently; but it peels off in pieces as in lizards, and not as in the freshwater snakes, in which the integuments come off entire.
Of the old Egyptian freshwater canal Dicuil learnt from one "brother Fidelis," probably another Irish monk, who, on his way to Jerusalem, sailed along the "Nile" into the Red Sea-passing on his way the "Barns of Joseph" or Pyramids of Giza, which are well described.
An example of the latter is seen in a common little freshwater bivalve, the Pisidium pusillum, which has been studied by Lankester.
Cycladidae.-One siphon or two free siphons with simple orifices; pallial line simple; hermaphrodite, embryos incubated in external gill-plate; freshwater, Cyclas; British.
The nucleus of the city is built on low-lying ground on the east coast of the island of Zealand, between the sea and a series of small freshwater lakes, known respectively as St JOrgens So, Peblings So and Sortedams So, a southern portion occupying the northern part of the island of Amager.
At suitable localities of the coast which are sheltered from the waves and overgrown with seaweed, especially in rock-pools, one or two males establish themselves with their harems, and may be observed without difficulty, being quite as fearless as their freshwater cousins.