Spawning takes place in summer, the season extending from June to October.
In about ten days, when the mass is milkwarm, the bed will be ready for spawning, which consists of inserting small pieces of spawn bricks into the sloping sides of the bed, about 6 in.
After the spawning the schools break up into smaller companies which are much scattered, and offer for two or three months employment to the hand-line fishermen.
The season of spawning is different in different places, and even in the same district, e.g.
The east coast of Scotland, there are herrings spawning in spring and others in autumn.
In the British Isles the 1 The name of the fishes of the genus Cyprinus is derived from the island of Cyprus, the ancient sanctuary of Venus; this name is supposed to have arisen from observations of the fecundity and vivacity of carp during the spawning period.
In length have been taken in the Zuider Zee, and these must be held to have been derived from the spawning of the previous summer.
In search of a gravelly spawning-ground the sturgeon go up the river as far as Sarepta (250 m.).
Such property right should undoubtedly be extended to natural beds, or else an area of natural spawning territory, should be kept under constant control and surveillance by government, for the purpose of maintaining an adequate supply of seed oysters.
Yet in this area, according to the investigations of Mr Williamson (Report of the Scottish Fishery Board for 1898), nearly 500 millions of plaice eggs are naturally produced in one spawning season.
It is in better condition at the beginning of winter than after the spawning season, which falls in the months of February and March.
There is reason to believe that these young herrings are derived from a local "winter" race spawning about February and March, and having nothing to do with the great shoals of the more open sea spawning in the North Sea in November.
Finally, in this connexion, the first steps in domestication, beginning with the improvement of natural corrals or spawning ground, and hunting with trained dogs and animals.
Spawning takes place in June and July, and the eggs, like those of the majority of marine fishes, are buoyant and transparent, but they are peculiar in having an elongated, sausage-like shape, instead of being globular.