Prize Essay On the Natural And Economical History of the Fishes Marine Fluviati
Prize Essay On the Natural And Economical History of the Fishes Marine Fluviati
Richard Parnell
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The furrow is generally from six to nine inches in depth, and when the spawn has appeared to be covered beyond that depth, this has occurred from some other circumstances, such as the stream or floods having carried downwards additional masses of gravel, &c. After this great effort has been ac- complished, both sexes are reduced to a state of remarkable emaciation. The elongated nose, and hooked jaw, and the brilliant colours, are almost immediately lost, the old scales are cast, and the fish r...etire to some pool to regain their strength. They finally redescend to the sea by easy stages, where their former condition and silvery lustre are regained, * their strength invigorated, and all their functions so re- paired as to enable them ere long to renew their visit to the flowing streams, again to multiply their race. "f Thespawnis shed in different rivers, sooner or later, between the month of October and the end of April, and continues covered by the gravel from about a hundred to a hundred and fourteen days, after which it begins to vivify ; and it is probable, under certain circumstances, such as the tempera- ture of the water and the mildness of the season, that the ova may become developed much sooner, or within a few weeks after their deposition.
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