利用2005年10月至2006年1月印度洋公海撒雅德玛哈浅滩(Saya de Malha Bank)丝尾红钻鱼(Etelis coruscans)延绳钓渔获物生物学测定数据,应用统计及回归方法分别对310尾丝尾红钻鱼的性腺成熟度、性别比例、叉长分布、叉长与体质量(GW)的...利用2005年10月至2006年1月印度洋公海撒雅德玛哈浅滩(Saya de Malha Bank)丝尾红钻鱼(Etelis coruscans)延绳钓渔获物生物学测定数据,应用统计及回归方法分别对310尾丝尾红钻鱼的性腺成熟度、性别比例、叉长分布、叉长与体质量(GW)的关系等进行了研究。结果表明:(1)雄性个体所占比例高于雌性个体,雌性与雄性个体的性别比例为1∶2.39;(2)丝尾红钻鱼性腺成熟度以Ⅴ、Ⅵ级为主,Ⅴ级比例最高,占60.80%,其中分性别统计,雌性、雄性丝尾红钻鱼的性腺成熟度皆为Ⅴ级比例最高,分别为52.27%和65.24%,雌性丝尾红钻鱼中性腺成熟度Ⅵ级个体比例(30.68%)远高于雄性样本中性腺成熟度Ⅵ级个体比例(5.71%);(3)叉长分布基本上符合正态分布,优势叉长为683～803mm,平均叉长为747mm,在同一性腺成熟度时,雌性丝尾红钻鱼的平均叉长略大于雄性丝尾红钻鱼的平均叉长;(4)根据幂函数回归所得叉长(FL)与体质量(W)的关系式为W=9.4390×10-6FL3.0817,其生长指数b值略大于太平洋海域丝尾红钻鱼种群的生长指数b值;(5)雌雄个体叉长与体质量关系式比较发现,在叉长小于897mm时,雄性个体的体质量大于雌性个体体质量。在叉长大于897mm时,则雌性个体体质量大于雄性个体体质量。展开更多
The study is carried out on the effect of drilling noise and vibration on growth of grass carp, Myloparyngodon Piceus, by using cut-fin marking method in situ. Compared with other methods, the method is more appropria...The study is carried out on the effect of drilling noise and vibration on growth of grass carp, Myloparyngodon Piceus, by using cut-fin marking method in situ. Compared with other methods, the method is more appropriate, for its operation is simpler and more data may be obtained under the same condition. The results show that drilling noise and vibration have significant effect on the growth of grass carp. Critical equivalent noise and vibration grade ( Nleq and Vleq ) are about 84.4 dB and 90.2 dB, and the affecting radius is about 8.5 m. The effect of drilling noise and vibration could be influenced by some factors, such as duration of pollution and body weight of grass carp, etc. Grass carp’s growth could rapidly recover after removing drilling noise and vibration, indicating that the drilling noise and vibration do not damage the fish organs and the effect is reversible. Therefore, the effect mechanism may be due to the activating response of non-hearing system.展开更多
文摘利用2005年10月至2006年1月印度洋公海撒雅德玛哈浅滩(Saya de Malha Bank)丝尾红钻鱼(Etelis coruscans)延绳钓渔获物生物学测定数据,应用统计及回归方法分别对310尾丝尾红钻鱼的性腺成熟度、性别比例、叉长分布、叉长与体质量(GW)的关系等进行了研究。结果表明:(1)雄性个体所占比例高于雌性个体,雌性与雄性个体的性别比例为1∶2.39;(2)丝尾红钻鱼性腺成熟度以Ⅴ、Ⅵ级为主,Ⅴ级比例最高,占60.80%,其中分性别统计,雌性、雄性丝尾红钻鱼的性腺成熟度皆为Ⅴ级比例最高,分别为52.27%和65.24%,雌性丝尾红钻鱼中性腺成熟度Ⅵ级个体比例(30.68%)远高于雄性样本中性腺成熟度Ⅵ级个体比例(5.71%);(3)叉长分布基本上符合正态分布,优势叉长为683～803mm,平均叉长为747mm,在同一性腺成熟度时,雌性丝尾红钻鱼的平均叉长略大于雄性丝尾红钻鱼的平均叉长;(4)根据幂函数回归所得叉长(FL)与体质量(W)的关系式为W=9.4390×10-6FL3.0817,其生长指数b值略大于太平洋海域丝尾红钻鱼种群的生长指数b值;(5)雌雄个体叉长与体质量关系式比较发现,在叉长小于897mm时,雄性个体的体质量大于雌性个体体质量。在叉长大于897mm时,则雌性个体体质量大于雄性个体体质量。
文摘The study is carried out on the effect of drilling noise and vibration on growth of grass carp, Myloparyngodon Piceus, by using cut-fin marking method in situ. Compared with other methods, the method is more appropriate, for its operation is simpler and more data may be obtained under the same condition. The results show that drilling noise and vibration have significant effect on the growth of grass carp. Critical equivalent noise and vibration grade ( Nleq and Vleq ) are about 84.4 dB and 90.2 dB, and the affecting radius is about 8.5 m. The effect of drilling noise and vibration could be influenced by some factors, such as duration of pollution and body weight of grass carp, etc. Grass carp’s growth could rapidly recover after removing drilling noise and vibration, indicating that the drilling noise and vibration do not damage the fish organs and the effect is reversible. Therefore, the effect mechanism may be due to the activating response of non-hearing system.
