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Beak Measurements of octopus (octopus variabilis) in Jiaozhou Bay and Their Use in Size and Biomass Estimation

Journal of Ocean University of China 2013年第3期12卷 469-476页

作者： XUE Ying REN Yiping MENG Wenrong LI Long MAO Xia HAN Dongyan MA Qiuyun Fisheries College Ocean University of China Oceanic and Fishery Administration of Lianyun District Nantong Station Regional Bureau of East China Sea Fishery ManagementMinistry of Agriculture of China

Cephalopods play key roles in global marine ecosystems as both predators and *** estimation of original size and weight of cephalopod from beak measurements is a powerful tool of interrogating the feeding ecology of predators at higher trophic *** this study,regressive relationships among beak measurements and body length and weight were determined for an octopus species(octopus variabilis),an important endemic cephalopod species in the northwest Pacific Ocean.A total of 193 individuals(63 males and 130 females) were collected at a monthly interval from Jiaozhou Bay,*** relationships among 6 beak measurements(upper hood length,UHL;upper crest length,UCL;lower hood length,LHL;lower crest length,LCL;and upper and lower beak weights) and mantle length(ML),total length(TL) and body weight(W) were *** showed that the relationships between beak size and TL and beak size and ML were linearly regressive,while those between beak size and W fitted a power function *** and UCL were the most useful measurements for estimating the size and biomass of *** relationships among beak measurements and body length(either ML or TL) were not significantly different between two sexes;while those among several beak measurements(UHL,LHL and LBW) and body weight(W) were sexually *** male individuals of this species have a slightly greater body weight distribution than female individuals,the body weight was not an appropriate measurement for estimating size and biomass,especially when the sex of individuals in the stomachs of predators was *** relationships provided essential information for future use in size and biomass estimation of ***,as well as the estimation of predator/prey size ratios in the diet of top predators.

关键词： octopus variabilis Jiaozhou Bay beak measurement body size hood length crest length

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