In this study, the samples of Argentine shortfin squid Illex argentinus were collected by the Chinese squid jigger fleet during January to March in 2010, and the dorsal mantle length (DML) of the samples ranged from 166 mm to 266 mm. The total of 264 pairs of beaks(143 pairs for female and 121 pairs for male) were extracted, and the morphological indices in lower beak were measured, including Lower Hood Length ( LHL) , Lower Crest Length ( LCL ) , Lower Rostral Length ( LRL) , Lower Lateral Wall Length ( LLWL) and Lower Wing Length (LWL). The stages of beak pigmentation of those samples were checked based on the standard of Stage 0 to Stage 7. Combined with the ontogenesis, maturity stage of /. argentinus and growth of beak, the variation of beak pigmentation stages were preliminarily analyzed. The results showed that Stage 3 was the dominant proportion,accounting for 35. 98% of the total samples during January to March. The monthly average level of beak pigmentation increased with the time passage from January to March. The beak pigmentation degrees of the samples increased with the growth of DML and body weight, and there were the significant linear relationships between beak pigmentation degrees and DML, beak pigmentation degrees and body weight ( P < 0. 01 ). The beak pigmentation degrees had a significant relationship with the sexual maturity stage for female squid (P <0. 01) ,but had not significant relationship for male squid (P > 0. 05 ). The differences existed in the relationships between different morphological parameters of beaks( LHL,LCL,LRL, LLWL and LWL) and pigmentation stages, in which the significant relationships with LHL,LLWL and LWL are provided(P <0. 01).%根据2010年1-3月中国鱿钓船采集的阿根廷滑柔鱼样本(胴背长范围为166 ～266 mm),提取出264对角质颚(雌性143对,雄性121对),测定下头盖长(LHL)、下脊突长(LCL)、下喙长(LRL)、下喙宽(LRW)、下侧壁长(LLWL)、下翼长(LWL)等6个形态参数,按角质颚色素沉积等级0～7级进行了划分,分析阿根廷滑柔鱼角质颚色素变化,及其与个体生长、性腺成熟度以及角质颚生长等因素的关系.分析认为,1-3月阿根廷滑柔鱼角质颚色素沉积以3级为优势,占总样本的35.98％.色素沉积的平均等级总体上随着月份推移而增加.胴背长与体质量随着色素沉积的增加而呈线性增加,相关关系显著(P＜0.01).雌雄个体的性腺成熟度与角质颚色素沉积等级的关系有差异,其中雌性个体的色素沉积等级与性成熟度之间呈显著的正相关(P＜0.01),雄性个体则不显著(P＞0.05).角质颚各外部形态参数与色素沉积等级之间的关系有一定的差异,其中与LHL、LLWL、LWL关系显著(P＜0.01).
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