东海南部海域头足类群落结构特征及其与环境关系

为了研究杜氏枪乌贼(Uroteuthis duvaucelii)角质颚形态和生长特征，根据2015年9—10月在南海北部海域采集的样本，通过测定样本胴长(L_M)、体质量(M)和角质颚的形态值，建立胴长与体质量以及角质颚形态参数与胴长的关系，并利用方差分析法比较不同个体和性成熟度间杜氏枪乌贼角质颚形态的差异。结果表明，不同性别未成熟个体间胴长存在显著差异(P<0.01)，雌性不同成熟度个体间体质量存在显著差异(P<0.01)，胴长和体质量关系符合幂函数，未成熟和性成熟个体的生长系数b分别为2.22~2.25和1.75；性成熟与未成熟个体间角质颚形态值存在显著差异(P<0.01)，不同性别未成熟个体间则不存在显著差异(P>0.05)；选取的6个角质颚形态参数值与胴长的关系均符合线性生长模型；通过方差分析，认为不同胴长组之间，雌性杜氏枪乌贼角质颚形态存在显著差异(P<0.01)，结合性成熟度分析，发现角质颚形态参数同时受到胴长与性成熟度间交互作用的影响(P<0.01)。

Fishery and population characteristics of the Indian squids Loligo duvauceli, Orbigny, 1848 from trawl survey along the north-west Red Sea

In order to investigate the influence of size and maturity on the beak morphology of Indian squid (Uroteuthisduvaucelii), we collected the samples from the northern South China Sea during September to October in 2015, and measured the mantle length (L_M), body mass (M), beak morphometircs, and then established their relationship. The beak morphometrics variation among different sizes and maturity stages was evaluated by ANOVA test. The results show that immature individuals had significant difference in L_M between sexes, while mature and immature females had significant difference in M. The relationship between L_M and M was fitted with power function. The growth indices (b) ranged from 2.22 to 2.25 and to 1.75 for immature and mature individuals, respectively. The beak morphometrics of mature individuals differed with those of immature individuals, and there was no significant difference in beak morphometrics between sexes for immature individuals. The selected six beak morphometrics fitted with L_M as linear model. The ANOVA test shows that female beak morphometrics had significant difference among different L_M groups (P<0.01). Considering with the maturity stage, these beak morphometrics were also influenced by the interaction between L_M groups and maturity stages (P<0.01).