Wright-López Humberto, Holguín-Quiñones Oscar, Arreguín-Sánchez Francisco, Roque-Villada Irene
Centro Interdisciplinario de Ciencias Marinas-IPN, Playa el Conchalito S/N, La Paz, Baja California Sur, México.
Rev Biol Trop. 2009 Mar-Jun;57(1-2):53-61.
The Mexican Pacific mother-of-pearl Pinctada mazatlanica was placed in forbidden fisheries status for the Mexican Federal Government and considered in extinction danger since 1939. This decree was modified in 1994 to allow the capture of spat for research or marine culture. We estimated the growth and mortality of mother-of-pearl from the eastern littoral of South Baja California wild stock in the periods 1992-93 and 1997-99. We used 38 sample stations at 2 bays and 6 insular complexes. The maximum length was 187.22 mm (179.83-195.81 mm, P > 0.95). Seasonal von Bertalanffy growth (ELEFAN I routine) values are: L(infinity) = 193.31 mm, k = 0.54 year(-1), t(0) = -0.1805 year, C = 0.49 and WP = 0.75. The growth performance index was Phi' = 4.305. The total mortality was calculated from a length-converted catch curve Z = 2.03 año(-1). Length-weight relationship W(i) = 0.0005418 * L(i)(2.7301). The growth parameters were similar to those for Pinctada margaritifera var. cumingi (open ocean wild stocks). The wild stock oysters differ from culture individuals at experimental repopulation conditions in Paz Bay. The total mortality is similar to that for Pinctada radiata in the Red Sea.
墨西哥太平洋珠母贝马氏珠母贝自1939年起被墨西哥联邦政府列入禁捕渔业名录，并被视为濒危物种。1994年该法令有所修改，允许捕捞幼贝用于研究或海水养殖。我们估算了1992 - 1993年和1997 - 1999年下加利福尼亚半岛东部沿海野生马氏珠母贝种群的生长和死亡率。我们在2个海湾和6个岛屿群设置了38个采样站。最大壳长为187.22毫米（179.83 - 195.81毫米，P > 0.95）。季节性冯·贝塔朗菲生长（ELEFAN I常规）值为：L(∞)=193.31毫米，k = 0.54年⁻¹，t(0)= - 0.1805年，C = 0.49，WP = 0.75。生长性能指数为Φ' = 4.305。总死亡率通过长度转换渔获曲线计算得出，Z = 2.03年⁻¹。体长 - 体重关系为W(i)=0.0005418 * L(i)(².⁷³⁰¹)。生长参数与珠母贝变种珠母贝（开阔海洋野生种群）相似。在帕斯湾实验性放流条件下，野生种群牡蛎与养殖个体有所不同。总死亡率与红海的辐射珠母贝相似。
