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Survival and emergence pattern of sea trout fry in substrata of different compositions
Author(s) -
Rubin J.F.
Publication year - 1998
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1998.tb00111.x
Subject(s) - salmo , biology , hatching , brown trout , granulometry , fishery , trout , salmonidae , limiting , yolk , zoology , ecology , fish <actinopterygii> , paleontology , sediment , mechanical engineering , engineering
The emergence of the sea trout Salmo trutta fry of Gotland, Sweden, was studied in the laboratory. The main limiting factor for survival up to hatching was the interstitial oxygen concentration, which depends on the gravel permeability, therefore on the substratum granulometry. Fry emergence was possible in substrata in which the geometric mean particle diameter ( d g ) was >15 mm and in substrata in which d g was <6 mm. In the substrata of low d g , emergence took place earlier than in the other ones. As a consequence the fry were smaller and their yolk sac only partially resorbed. In an unfavourable environment, fry started to emerge as soon as they reacted positively to light, about 2 weeks after hatching.