中国水产科学2018，Vol.25Issue(2)：395-402,8.DOI:10.3724/SP.J.1118.2018.17150
南海北部陆坡金鼻眶灯鱼秋季摄食节律
Feeding rhythm of Diaphus chrysorhynchus on the north slope of the South China Sea
摘要
Abstract
Mesopelagic fishes are a key component of oceanic ecosystems. Feeding rhythm is important for the study of energy flow and material cycles in food webs that include mesopelagic fish. In this study, we examined the feeding rhythm of Diaphus chrysorhynchus based on trawl-survey data from October 2014,on the north slope of the South China Sea, and analyzing their feeding intensity. (1) The lengths of D.chrysorhynchus sampled ranged from 28 mm to 110 mm, concentrated in the range of 50 to 59 mm. There was no significant relationship between body length and feeding intensity(P=0.054,n=228).(2)D.chrysorhynchus started feeding at about 18:00 every day (rising together with zooplankton), finished feeding at about 05:30 the next morning (sinking with the zooplankton),and fed continuously during that period.The average feeding intensity of D.chrysorhynchus,among five sampling times, ranged from 1.50 to 2.57, showing an increasing trend. (3) There was a significant difference in the feeding intensity of D.chrysorhynchus between evening,and night or early morning,reflected in the com-parison of three periods, namely 18:30-19:30 and 01:00-02:00, 04:45-05:50, and 06:30-07:30 (P=0.041, P=0.000, and P=0.007 respectively). In addition, there was a highly significant difference (P=0.005) in the feeding intensity of D.chrysorhynchus between 03:30-04:30 and 04:45-05:50.(4)The percentage of feeding intensities of D.chry-sorhynchus among 5 periods showed a wave trend,the fourth feeding-intensity percentage had the highest value at 06:30–07:30, the zero feeding intensity percentage had the highest value at 18:30-19:30, and was half of this value at 03:30-04:30, and then decreased continuously until 06:30-07:30. In general,D.chrysorhynchus showed con-tinuous feeding and egestion from evening to the next morning, while feeding was concentrated during the morn-ing. In conclusion,D.chrysorhynchus,a mesopelagic fish species, fed on zooplankton from evening to the next morning, with habits of diel vertical migration and egestion from 01:00 till a certain time the next day.D.chry-sorhynchus plays an important role in material and energy flow on the continental slope of the South China Sea.关键词
南海/陆坡/中层鱼/金鼻眶灯鱼/摄食节律/摄食强度Key words
South China Sea/continental slope/mesopelagic fish/Diaphus chrysorhynchus/feeding rhythm/feeding intensity分类
农业科技引用本文复制引用
李忠义,郑珊,杨尧尧,应一平,陈作志,王新良,赵宪勇,龚玉艳,张俊,张武昌..南海北部陆坡金鼻眶灯鱼秋季摄食节律[J].中国水产科学,2018,25(2):395-402,8.基金项目
国家973计划项目(2014CB441500). （2014CB441500）
