闽南-台湾浅滩渔场大头狗母鱼的渔业生物学

Fishery biology of Trachinocephalus myops in Minnan-Taiwan Shoal Fishery Ground

闽南-台湾浅滩渔场大头狗母鱼捕捞群体由0～Ⅵ龄组7个世代组成。Ⅰ龄时性成熟，生殖期2～10月。VonBertalanffyvay又长生长方程Lt=609．26×［1-e-0.085(t+2.8767)］，总体重生长方程Wt=1075.68×［1－e-0.1393(t+2.5215)］3,最佳最小可捕叉长和总体重分别为171．3mm和69．1g。目前，该渔场单拖作业捕捞群体以Ⅰ龄和ⅡI龄鱼为主，其优势又长160～200mm。较1977年减少约20mm，且小于最佳最小可捕叉长个体多达35．7％，应引起渔业管理部门的高度重视。

Trachiocephalus myops' s catch consists of 7 Year-classes from age 0 to age 6 in the Min-nan-Taiwan Shoal Fishery Ground. Sexual maturity is at age 2. The spawning time is fromFeb. to Oct. The fork length growth eguation of von Bertalanffy is Lt = 609. 26 × [1 -e-0.085(t+2. 876 7)],the total body weight growth eguation of von Bertalanffy is Wt = 1 075. 68 ×[ 1 - e-0. 139 3(t+2.521 5)]. The best minimum of fishing fork length and total body weight arel71. 3mm and 69. 1g respectively. Age Groups 1 and 2 are the dominant in the catch of singleboat trawling in the Minnan-Taiwan Shoal Fishery Ground. Dominant fork length groups are160 to 200mm, 20mm shorter than that in 1977 accouts for 35. 7% in the catch. The in-dividuals which are than the minimum of fishery fork length. It is a problem needs attentionby the fishery administrators.