Growth and Mortality of the Red-Spot Prawn (Metapenaeopsis Barbata) in the Northeastern Coast off Taiwan

台灣東北部沿岸產紅斑赤蝦(Metapenaeopsis Barbata)之成長參數及死亡率之估計

曾宗德(Tzong-Der Tzeng) ； 邱進祥(Chin-Shiang Chiu) ； 葉顯椏(Shean-Ya Yeh)

《臺灣水產學會刊》 32卷3期 (2005/09) Pp. 229-238

https://doi.org/10.29822/JFST.200509.0004

摘要

本研究係利用1995年2月至1996年2月间，連續12個月之月別體長資料，以ELEFAN法來估計台灣東北部沿岸產紅斑赤蝦(Metapenaeopsis barbata)之季節性成長參數、死亡率及開發率。應用雌雄蝦之頭胸甲長頻度分佈擬合季節性本托蘭裴成長方程式(von Bertalanffy growth equation)，其結果分別如下：(1)雌蝦：成長參數K=1.5(year^(-1))，極限頭胸甲長L(下標 ∞)=27.4mm, C=0.95, WP=0.25; (2)雄蝦：K=1.14(year^(-1)), L(下標 ∞)=23mm , C=0.95, WP=0.59。利用季節化體長轉換漁獲體量曲線估計其全死亡率，雌雄結果分別為4.80(year^(-1))和4.10(year^(-1))。自然死亡率雌雄估計值分別為2.69((year^(-1))和2.32((year^(-1))。漁獲死亡率雌雄估計值分別為2.11（(year^(-1))和1.78((year^(-1)）。雌雄之開發率估計值分別為0.44和0.43，顯示此紅斑赤蝦系群尚屬於低開發狀態。

關鍵字

Metapenaeopsis barbata ； 成長參數 ； 死亡率 ； ELEFAN ； 台灣

並列摘要

Seasonal growth parameters, mortalities and exploitation rate of red-spot prawn (Metapenaeopsis barbata) in the northeastern coast off Taiwan were examined using 12 monthly length-frequency data (February 1995 to February 1996) and analyzed with the ELEFAN methods. Parameters of the von Bertalanffy growth equation with seasonal fluctuations obtained are (1) K (growth coefficient)=1.5 year^(-1), L(subscript ∞)(asymptotic length) = 27.4 mm carapace length (CL), C (amplitude of seasonal growth oscillation) = 0.95, WP (winter point) = 0.25 of year, and Rn = 0.575 for females; and (2) K = 1.14 year^(-1), L(subscript ∞)= 23 mm CL, C = 0.95, WP = 0.59, and Rn = 0.556 for males. The instantaneous rate of total mortality obtained through seasonalized length-converted catch curve for females and males are 4.80 and 4.10 year^(-1), respectively. The instantaneous rate of natural mortality is 2.69 year^(-1) in females and 2.32 year^(-1) in males. The instantaneous rate of fishing mortality is 2.11 year^(-1) in females and 1.78 year^(-1) in males. The exploitation rate, E = 0.44 in females and 0.43 in males, implies that the stock is slight under-exploited.

並列關鍵字

Metapenaeopsis barbata ； growth parameter ； mortality ； ELEFAN ； Taiwan