胶州湾水域短吻舌鳎年龄、生长及其年龄结构特征的研究

STUDIES ON AGE, GROWTH AND AGE-CLASS STRUCTURES OF THE TONGUEFISH, CYNOLOSSUS ABBREV1ATUS (GRAY), IN THE JIAOZHOU BAY WATERS.

依2450尾短吻舌鳎渔业生物学测定和耳石观测,数理分析得出,耳石轮径与鱼体全长呈线性相关,与纯体重呈显著幂函数关系。运用过程分析法确认年轮形成以年为周期,主要为4～5月。经二次线性拟合年间 Von Bcrtalanffy 生长方程:雌鱼L_t=350.8996[1—e^(-O.3965(t+0.7574)], W_t=269.1963[1—e^(-0.392(t+0.7165)]3.1175;雄鱼L_t=314.0091[1—e^(-0.3444(t+1.1236))],W_t=191.6984[1—e^(-0.3263(t+0.9666)]~2.8788胶州湾水域短吻舌鳎年龄构成0～Ⅷ龄,Ⅱ龄鱼占优势(34.06％)。

Age and growth of the tonguefish, Cynolossus abbreviatus (gray), were studied based on 2 450 specimen collected in successive investigation of fishery ecological fundament by demersal trawling in the Jiaozhou Bay from June 1980 to July 1988. Using sine-expanded process analysis, the annual ring formed from March to May, mainly in late April and early May, which corresponds to maturation of parent stock and warming up of water temperature. The exponent function of total length (La) net weight (Wn: removed liver and gonad tissues) and versus radius of otolith (R) can be expressed as:La= 11.129 5R0.988and Wn = 3.919 1×10-3R3.187 7 for female and La =9.414R1.037 9 and Wn = 2.069 8×10-3R3.377 8 for male. Linear plotting with von Bertalanffy growth equation for back-calculated La and Wn, the growth stanza could be expressed as: Lt = 350.899 6[1-e-0.395(t+0.757 4)] and Wt= 269.196 3[1- e-0.392 0(t+0.716 5)]3.1175 for female and Lt = 314.009 1[1-e-0.344 4(t+1.123 6)] and Wt = 191.698 4[1 - e-0.326 3(t+0.966 6)]2.878 8 for male. The results showed that the population is composed of 0-Ⅷ age group and dominated by Ⅱ year group (34.06%). The life history tactics trends to K-selection with high growth rate (k>0.3) and natural mortality (M = 0.607 1).