北海营盘近海区马氏珠母贝自然资源调查

2006年12月6日至27日对北海营盘近海马氏珠母贝(Pinctada martensii Dunker)自然资源进行调查。调查分为群访调查和海上调查,群访调查是到主要珍珠养殖自然村及北海、营盘渔港码头收集人工捕捞或养殖的马氏珠母贝,海上调查是对北海营盘近海区的9450hm2水域设29个站位捕捞马氏珠母贝。结果群访调查收集到185个天然马氏珠母贝,海上调查仅有5个站出现马氏珠母贝,共获珠贝12个。个体最大的是自然海区生长的马氏珠母贝,壳长最大者达100.4mm,平均76.1mm;壳高最高为114mm,平均70.9mm。海上调查捕获的马氏珠母贝体重18.4~182.5g,平均值为85.6g;年龄2.5~6龄,平均5龄,占大型底栖贝类数量的0.34%。马氏珠母贝的数量已是少之又少,保护马氏珠母贝资源迫在眉睫。

Investigation on Pinctada martensii Resources in Sea Areas of Yingpan, Beihai

P.martensii resources in the sea areas of Yingpan, Beihai during Dec.6~27, 2006 were investigated.Both visit investigation and sea area invested methods were used.The visit investigation was to collect P.martensii of fishing or cultured in main pearl culture area and fishing wharf of Beihai and Yingpan.The sea area invested was setting 29 sites to fishing P.martensii in the sea area of Yingpan, Beihai (areas 9450hm²).The result displayed that P.martensii samples could be found in 5 stations of 29, covered 17.2%.In the 12 caught pieces of P.martensii, their shell-lengths were 53.0mm~99.0mm, the average-length was 85.8mm;shell-heights were 66.0~114.0mm, the average-height was 87.8mm;shell-thickness were 14.0~37.0mm, the average-thickness was 26.2mm.They weighted from 18.4g to 182.5g, average for 85.6g.Their ages were from 2.5 to 6 years, the average-age was 5 years.P.martensii consist 0.34% of the all shells in the investigated area.They are so rare that need to be protected.