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Feeding Habits of the Japanese Threadfin Bream (Nemipterus japonicus) in the Waters off Southwestern Taiwan

摘要


This study investigated the feeding habits of the Japanese threadfin bream (Nemipterus japonicus) by analyzing the stomach contents of 915 fish caught by trawlers in the waters off southwestern Taiwan from September 1991 to August 1992. Crustaceans and teleost fish were the dominant food organisms of N. japonicus, with the percentage gravimetric composition being 47.7% (including 5 families and 10 species) and 47.6% (including 15 families and 19 species), respectively. The top five taxa of living organisms according to their percentage gravimetric composition were Acetes intermiedius (17.9%), Diaphus sp. (17.1%), Sergia lucens (9.3%), Acetes sp. (8.3%), and eel larvae (7.8%). The food type with the highest percentage of occurrence frequency was teleost fish in spring, whereas that in summer, autumn, and winter was crustaceans. The dominant living organisms based on the percentage of gravimetric composition by season were Diaphus sp. (46.9%) and S. lucens (12.4%) in spring, A. intermedius (33.2%) and Acetes sp. (20.6%) in summer, A. intermedius (22.0%) and Diaphus sp. (17.0%) in autumn, and S. lucens (16.1%) and Loligo chinensis (12.3%) in winter. The percentage of numerical composition by season was also analyzed, and the results were similar to the percentage of gravimetric composition. However, no significant difference in feeding habits was observed among N. japonicus individuals with different body sizes and between sexes (p > 0.05).

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