Premium
Density‐dependent mortality of trout fry (Salmo trutta L. ) and its relationship to the management of small streams
Author(s) -
Mortensen Erik
Publication year - 1977
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.1095-8649.1977.tb05719.x
Subject(s) - salmo , streams , biology , trout , fishery , mortality rate , brown trout , fish <actinopterygii> , weed , ecology , demography , computer network , sociology , computer science
The natural mortality rate of trout fry and the impact of weed cutting and cleaning out of weeds, branches and twigs from the stream‐bed upon the mortality rate of trout fry was studied on several reaches in small streams. Above an initial density of 3.1 fry m –2 natural mortality rate was found to be density‐dependent in the first few months of life. In reaches where weed cutting and cleaning out of the stream‐bed had taken place the mortality rate was higher than that found under natural conditions in undisturbed reaches. The results support the suggestion that stream management works which make the stream more uniform will be in conflict with sound fishery management.