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根据2009年7-8月在哥斯达黎加外海探捕期间采集的281尾茎柔鱼样本,对其生物学特性进行初步分析。结果表明:茎柔鱼样本胴长范围为205～429 mm,优势胴长为260～360 mm,占81.14%;体重范围为0.17～1.69 kg,优势体重为0.2～1.0 kg,占88.26%;雌雄性比约为3.76∶1,性腺成熟度以Ⅲ和Ⅳ期为主,雄性、雌性性成熟的比例分别为94.92%和66.67%;摄食等级以0～1级为主,占89.32%。体重与胴长关系W=2.35×10-7LM2.5944。相对于加利福尼亚湾、秘鲁和智利外海的茎柔鱼,哥斯达黎加外海茎柔鱼个体较小且体型偏瘦,属于小型或中型群体。
A preliminary analysis of its biological characteristics was carried out on a sample of 277 fish collected from the sea of Costa Rica during July-August 2009. The results showed that the length of capitatum was 205 ~ 429 mm, the length of dominant capitula was 260 ~ 360 mm, accounting for 81.14%; the weight range was 0.17 ~ 1.69 kg; the dominant weight was 0.2 ~ 1.0 kg, accounting for 88.26% The sex ratio was about 3.76:1. The gonad maturation was mainly in stage Ⅲ and Ⅳ. The male and female sexual maturity were 94.92% and 66.67%, respectively. The grading was 0 ~ 1, accounting for 89.32%. Body weight and body length relationship W = 2.35 × 10-7LM2.5944. Relative to the Gulf of California, Peru and Chile, the sea outside the stem Spermophilus, Costa Rica, offshore Spermophilus individual smaller and thinner, are small or medium-sized groups.