Wright-López Humberto, Holguín-Quiñones Oscar, Arreguín-Sánchez Francisco, Roque-Villada Irene
Centro Interdisciplinario de Ciencias Marinas-IPN, Playa el Conchalito S/N, Apdo. Postal 592, C. P. 23000, La Paz, Baja California Sur, México.
Rev Biol Trop. 2009 Sep;57(3):659-70.
The Gulf of California nacre shell Pteria sterna is an important marine resource in Mexico, and the main species for "half" and round pearl production in the American continent. Wild spat can only be extracted legally for research or culture activities. This study calculates growth and mortality parameters for wild stocks in the eastern coast of Southern Baja California. Height's data (353 dorso-ventral measurements) were taken from 1997 to 1999 at Santa Rosalia, Mulegé and Loreto Bay coast. The maximum length was estimated at 130.35 mm (124.22-136.48 mm, p>0.95). The length frequency data were set in a "virtual year". Seasonal von Bertalanffy growth parameters were calculated in the ELEFAN I routine, the values are: L(infinity) = 156.02 mm, k = 0.48 year(-1), t0 = -0.216 years, C = 0.43, WP = 0.73. and t(s) = 0.5. The growth performance index was phi' = 4.068. The total mortality was calculated from length-converted catch curve Z = 3.34 year(-1). The length-weight relationship was fixed for the equation W = 0.000756 * L(i)(2.7075) (r2 = 0.90, n = 233). The growth parameters values in experimental repopulation conditions are quite different, in contrast with the growth estimated in wild stocks oysters. The value of total mortality is similar to the estimations for Pinctada fucata populations from the Red Sea and P. radiata from the Mediterranean Sea.
加利福尼亚湾珍珠贝Pteria sterna是墨西哥一种重要的海洋资源，也是美洲大陆“半”珍珠和圆形珍珠生产的主要品种。野生贝苗只能合法地用于研究或养殖活动。本研究计算了南下加利福尼亚州东海岸野生种群的生长和死亡参数。1997年至1999年在圣罗萨利亚、穆莱赫和洛雷托湾海岸采集了高度数据（353个背腹测量值）。估计最大长度为130.35毫米（124.22 - 136.48毫米，p>0.95）。长度频率数据设定为一个“虚拟年份”。在ELEFAN I程序中计算季节性冯·贝塔朗菲生长参数，其值为：L(∞)=156.02毫米，k = 0.48年⁻¹，t0 = -0.216年，C = 0.43，WP = 0.73，t(s)=0.5。生长性能指数为φ' = 4.068。根据长度转换渔获曲线计算出总死亡率Z = 3.34年⁻¹。长度 - 重量关系确定为方程W = 0.000756 * L(i)(2.7075)（r² = 0.90，n = 233）。与野生种群牡蛎的生长估计相比，实验性再移植条件下的生长参数值有很大不同。总死亡率的值与红海的马氏珠母贝种群和地中海的辐射珍珠贝的估计值相似。
