Factors affecting the foods and feeding patterns of lake‐dwelling rainbow trout (Salmo gairdnerii)in the North Island of New Zealand
作者:
D. K. Rowe,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1984)
卷期:
Volume 18,
issue 2
页码: 129-141
ISSN:0028-8330
年代: 1984
DOI:10.1080/00288330.1984.9516036
出版商: Taylor & Francis Group
关键词: Salmo gairdnerii;Salmonidae;rainbow trout;Rotorua;lakes;food;food organisms;ecological distribution;feeding habits;forage fish;temperature;turbidity;eutrophication;hatcheries;sex;age
数据来源: Taylor
摘要:
Differences in feeding between age classes, males and females, and hatchery reared and wild rainbow trout(Salmo gairdnerii)in Lake Rotoma are described. Analysis of results, in conjunction with other published data on trout foods and feeding, showed that there was a summer increase in epibenthic feeding which, in Lake Rotoma, was most apparent in the species of forage fish predated. When trout feeding on forage fish was examined in a variety of lakes, 2 trends emerged. In large, clear, oligotrophic lakes trout fed predominantly on smelt(Retropinna retropinna)which are shoaling, epipelagic fish. Trout in small turbid lakes fed mainly on the solitary, benthic bully(Gobiomorphus cotidianus).These differences in feeding on forage fish were associated with the effects of water temperature and turbidity on trout distribution and foraging behaviour.
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