【摘要】：本文依據(jù)2015年5月至2016年5月在舟山漁場(chǎng)、舟外漁場(chǎng)和樂清海域生產(chǎn)漁船上采集的三疣梭子蟹(Portunus trituberculatus)樣品,研究了此海域三疣梭子蟹的生物學(xué)特征,將結(jié)果與以往研究進(jìn)行了比較。并計(jì)算目前浙江省三疣梭子蟹合理的放流容量。模擬不同的開發(fā)率情況下,三疣梭子蟹合理的增殖放流數(shù)量。在所采集的769尾三疣梭子蟹樣品中,其甲寬分布范圍為4.0cm～20.2cm,平均值12.5cm;甲長(zhǎng)分布范圍為2.0cm～11.7cm,平均值6.2cm;體重范圍為4.04g～576.00g,平均值116.00g;雌雄比約為1.28:1,雌性個(gè)體占優(yōu)。體重(W)-甲寬(L)關(guān)系為:W = 0.0644L2.9111。運(yùn)用FISAT-Ⅱ軟件進(jìn)行數(shù)據(jù)分析和處理,得出生長(zhǎng)參數(shù)L∞=21.0cm和K=0.83,建立 von Bertalanffy 生長(zhǎng)方程為:lt = 21(1-e-0.83(t+0.373))。與以往的研究結(jié)果相比,三疣梭子蟹的參數(shù)a值偏大,b值略偏小,但更接近于3。其甲長(zhǎng)與甲寬偏小,比值更接近于1:2,說明三疣梭子蟹個(gè)體趨于低齡化,小個(gè)體占比較大�；诩讓捊M成的漁獲量曲線估算三疣梭子蟹總死亡系數(shù)Z=2.94[年]-1,使用RikhterEfanov方法估算自然死亡系數(shù)M=1.707[年]-1。通過對(duì)歷史資料分析,設(shè)定上世紀(jì)80年代為未過渡捕撈時(shí)期,研究浙江海域三疣梭子蟹資源量約為6.128×109尾,而評(píng)估得到當(dāng)前浙江海域三疣梭子蟹資源量約為4.556×109尾,故目前浙江省三疣梭子蟹合理的增殖放流容量為1.572×109尾。模擬不同開發(fā)率情況下,三疣梭子蟹合理的增殖放流數(shù)量,合理放流容量與開發(fā)率呈現(xiàn)多項(xiàng)式關(guān)系,為y=-1.025x2 +2.0438x + 5.2113,其中 R2=0.9986。該研究的成果將有助于指導(dǎo)三疣梭子蟹資源增殖放流的科學(xué)開展,并且該方法也可以推廣應(yīng)用到其他種類,能為我國漁業(yè)資源增殖放流效果評(píng)價(jià)體系及標(biāo)準(zhǔn)的建立提供技術(shù)支撐。
[Abstract]:Based on the (Portunus trituberculatus) samples collected from fishing boats in Zhoushan fishing ground, off-boat fishing ground and Yueqing sea area from May 2015 to May 2016, the biological characteristics of Portunus trituberculus were studied. The results are compared with previous studies. The reasonable discharge capacity of Portunus trituberculus was calculated. Under different development rates, the number of proliferation and release of Portunus trituberculatus was reasonable. In the 769 samples of Portunus trituberculus, the distribution range of nail width was 4.0 cm ~ 20.2cm, the average value was 12.5 cm, the distribution range of nail length was 2.0 cm ~ (11. 7) cm, the average value was 6.2 cm, the weight range was 4.04 g ~ 576.00 g, the average value was 116.00 g, the ratio of female to male was about 1.28: 1, and the female was dominant. The (L) relationship between body weight (W) and nail width was: W = 0.0644L2.9111. Using FISAT- 鈪，

本文編號(hào)：2177809