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The biology of Fries’ goby, Lesueurigobius friesii (Malm), in the Firth of Clyde, Scotland, and a comparison with other stocks
Author(s) -
Nash R. D. M.
Publication year - 1982
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.1095-8649.1982.tb02825.x
Subject(s) - firth , biology , goby , fishery , population , sexual maturity , sex ratio , stock assessment , stock (firearms) , fish <actinopterygii> , demography , ecology , fishing , oceanography , geography , archaeology , sociology , geology
The general biology of a population of Lesueurigobius friesii in the Firth of Clyde, Scotland, was studied between October 1977 and December 1979. In this population the fish attained 95 mm and lived a maximum of nine years. The population growth characteristics from von Bertalanffy growth curves showed that the Clyde stock of L. friesii attained a greater maximum theoretical length (L∞) than stocks in the Lynn of Lorne or Biscay and had a lower growth coefficient ( K ). In all three stocks, the majority of the growth in length ( A 0.95 ) was achieved by the end of the fourth year of life. In general the sex ratio was 1: 1 throughout the season. Spawning occurred from May to August, approximately the same time as the Lynn of Lorne stock. Sexual maturity was first reached at a smaller size in males than females. The abundance of L. friesii in the Clyde fluctuated considerably with reduced numbers of fish caught just after spawning.