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At a temperature of 23.0~24.8℃,the mixed feeding of Japanese anchovy larvae was initiated 24 h before the yolk-sac was exhausted.The point of no return(PNR) was reached on the 6th day after hatching.On the 4th day after hatching,the pectoral angle appeared in both fed and unfed anchovy larvae although it was more evident and sharper in the starved and the PNR stage larvae than in the fed ones.According to observations of larvae collected in the sea,the pectoral angles were evident not only in the larvae of 3.62~7.44 mm in standard length,but also in the larvae of 2.70 mm in standard length with remnants of yolk.The pectoral angles became diffuse when the larvae reached 7.84 mm and vanished at 9.86 mm.The pectoral angle cannot be used as a criterion to distinguish healthy from starving larvae. 相似文献
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Abundance and biomass of meiobenthos in the spawning ground of anchovy (Engraulis japanicus) in the southern Huanghai Sea 总被引:3,自引:0,他引:3
1 Introduction Meiofauna is an important group in benthic small food web energetically due to their small size, high abundance and fast turnover rates. The production of meiofauna is equal to or higher than that of macrofau- na in estuaries, shallow waters and deep sea (Gerlach, 1971; Platt and Warwick, 1980; Heip et al., 1985; Zhang et al., 2004). A role of meiofauna may be the recycling of nutrients. Marine nematodes may keep the bacterial colonies on sand grains in active phase of growth … 相似文献
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WANG Yanjun LIU Qun MA Yuxia 《中国海洋大学学报(英文版)》2007,6(3):268-274
Anchovy(Engraulis japonicus) is an abundant fish species in the Yellow Sea,and its natural stock is decreasing rapidly in recent years. Based on the stock-recruitment(SR) data from 1987 to 2002 published in Zhao et al.(2003),the criterion BIC(Bayesian Information Criterion) is applied to selecting a suitable model from six normal and lognormal error structured SR statisti-cal models,the age-structured model is used to calculate the biological reference points(BRPs),and the precision of the SR parame-ters and BRPs are calculated using bootstrap method. The results indicate that the anchovy fishery resource in the Yellow Sea is in an over-fished state. The precaution management principle requires that the fishery should be closed immediately. 相似文献
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LIU Jinxian) ) GAO Tianxiang) WANG Yujiang) and ZHANG Yaping) ) The Key Laboratory of Mariculture Ministry of Education Ocean University of China Qingdao P.R.China ) Laboratory of Molecular Evolution Genome Diversity Kunming Institute of Zoology Chinese Academy of Sciences Kunming P. R. China 《中国海洋大学学报(英文版)》2005,4(1):85-88
1Introduction Japanese grenadier anchovy,Coilia ectenes Jordanet Seale(1905),is distributed in the northwest Pacif-ic.The congener,Osbeck's grenadier anchovy,Coil-ia mystus(Linnaeus,1758),is widely distributed inthe west Pacific.Both species inhabit coastal watersand estuaries and can reach up to rivers.The twospecies are important contributors to the coastal fish-eries of China(Zheng et al.,2003).Many studies on the fishery biology of the twospecies have been conducted(Zheng et al.,2003)… 相似文献
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