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Reproduction growth and mortality of the common bully gobiomorphus cotidianus in a eutrophic new zealand lake



Reproduction growth and mortality of the common bully gobiomorphus cotidianus in a eutrophic new zealand lake



Journal of Fish Biology 20(3): 259-270



G. cotidianus in Lake Waahi, North Island, New Zealand, spawned continuously between July 1976 and March 1977. Length frequency data indicated that 2, and briefly, 3 year classes, were present, each made up of 3 groups which were the progeny from successive peaks in spawning activity. Scale examination revealed checks to growth associated with spawning and stressful midsummer conditions. These and length frequency data were used in growth estimates which indicated that bullies reached 3.5-4.0 cm after their 1st yr and 5-6 cm after their 2nd but did not survive a 3rd yr. Mortality was associated with spawning and midsummer stress.

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