How to use Dorsal-fin in a sentence

dorsal-fin
  • All the fins have a rounded outline; the short dorsal fin is without a spine, but the males possess a very thick and flattened outer ray in the ventral fins.

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  • On their backs they have a fin called a dorsal fin which helps them to swim in a straight line.

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  • It is distinguished from the common porpoise externally by its black hue and the absence of a dorsal fin.

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  • The first dorsal fin and the ventrals are transformed into pointed formidable spines, and joined to firm bony plates of the endoskeleton.

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  • The weevers are poisonous and the venom is concentrated principally in the six spines of the first dorsal fin.

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  • If the view that the sole is protected by the blackness of the pectoral fin resembling the blackness of the dorsal fin of the weever, be correct, these fishes furnish an instance of Batesian mimicry.

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  • It is probable that the resemblance between Uranoscopus and Trachinus with respect to the colour of the dorsal fin is mutually beneficial to the two fishes.

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  • The vent is below the anterior half of the first dorsal fin.

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  • The ventral side of the body in the atrial region is broad and convex, so that the body presents the appearance of a spherical triangle in transverse section, the apex being formed by the dorsal fin and the angles bordered by two hollow folds, the metapleural folds, each of which contains a continuous longitudinal lymph-space, the metapleural canal.

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  • The flipper is short, broad, and truncated, and the dorsal fin a mere low protuberance.

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  • To render the organization of this creature perfect in relation to its wants, it is provided with three long filaments inserted along the middle of the head, which are, in fact, the detached and modified three first spines of the anterior dorsal fin.

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  • From its habit of coming to the surface in calm weather, showing its high dorsal fin above the water, it has also received the name of "sun-fish," which it shares with Orthagoriscus and the basking shark.

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  • In breeding coloration the male fish has a dark blotch at the rear of the first dorsal fin.

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  • As we moved slowly toward the blows a whale arched its back, showing a strongly falcate dorsal fin.

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  • The dorsal fin is also level with the pelvic fin in roach, in rudd it is behind the pelvic fin.

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  • The main difference between the species is that the first dorsal fin of the black goby is elongated.

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  • As it was speeding up, the tall dorsal fin of a male orca could be seen right next to it.

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  • The dorsal fin is also level with the pelvic fin in roach, in rudd it is behind the pelvic fin in roach, in rudd it is behind the pelvic fin.

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  • The Risso's dolphin is a large dolphin with a robust, stocky body that becomes more slender behind the dorsal fin.

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  • It appears that the elongated first dorsal fin spines are not always present.

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  • The dorsal fin of the lesser weever is all black, while that of the greater weever is dark only at the tip.

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  • Its body is well-proportioned, rather elongate, and somewhat like that of the European barbel, but covered with very large scales, of which there are only twentyfive or twenty-seven placed along the lateral line; the dorsal fin is armed with a long and strong spine, and the mouth provided with four slender and short barbels.

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  • The Risso 's dolphin is a large dolphin with a robust, stocky body that becomes more slender behind the dorsal fin.

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  • Propulsion is by undulations of the small dorsal fin.

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  • The concave dorsal fin begins above the base of the ventral fins.

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