宣立强, 卢伙胜, 何秀玲, 陈文河, 陈春亮, 张静. 茂名大放鸡海域文昌鱼分布与种群特性研究[J]. 中国生态农业学报(中英文), 2007, 15(2): 147-150.
引用本文: 宣立强, 卢伙胜, 何秀玲, 陈文河, 陈春亮, 张静. 茂名大放鸡海域文昌鱼分布与种群特性研究[J]. 中国生态农业学报(中英文), 2007, 15(2): 147-150.
XUAN Li-Qiang, LU Huo-Sheng, HE Xiu-Ling, CHEN Wen-He, CHEN Chun-Liang, ZHANG Jing. Studies on distribution and population of amphioxus (Branchiostoma belcheri)in Maoming Dafangji sea area[J]. Chinese Journal of Eco-Agriculture, 2007, 15(2): 147-150.
Citation: XUAN Li-Qiang, LU Huo-Sheng, HE Xiu-Ling, CHEN Wen-He, CHEN Chun-Liang, ZHANG Jing. Studies on distribution and population of amphioxus (Branchiostoma belcheri)in Maoming Dafangji sea area[J]. Chinese Journal of Eco-Agriculture, 2007, 15(2): 147-150.

茂名大放鸡海域文昌鱼分布与种群特性研究

Studies on distribution and population of amphioxus (Branchiostoma belcheri)in Maoming Dafangji sea area

  • 摘要: 研究表明茂名大放鸡海域的文昌鱼主要分布在东经111°10′~111°17′,北纬21°19′~21°27′区域,分布面积达195.5km2,平均资源密度为51~86尾/m2,最高达到815尾/m2,文昌鱼分布密度中心概位在小放鸡西至西北侧附近;体长结构具明显的季节变动,秋冬季节是文昌鱼的主要补充季节;性腺成熟度和性别比例在不同季节和生长阶段具有明显的差异,春季性成熟个体占的比重最高达65%;随着体长的增加文昌鱼性腺成熟度也渐次增加,体长与性腺成熟度比例成三次曲面关系;其性比随着体长增长发生明显变化,体长为35~60mm时雌雄个体性比接近1,体长大于60mm时雌性个体数量明显小于雄性;文昌鱼全年的体长体重关系方程为W=0.0012L3.32;当体长达到50mm后文昌鱼资源群体尾数减少系数为0.55/cm。

     

    Abstract: The investigation indicates that amphioxus (Branchiostoma belcheri) is mainly distributed within the area with 111°10′~111°17′longitude, 21°19′~21°27′ latitude, which covers 195.5km2 in Maoming Dafangji sea areas. The average resource density is 51~86 ind/m2 the highest is 815 ind/m2. The area with a high density is centered in the west and northwest of the Xiaofangji Island. The body length distribution of amphioxus has an obvious seasonal fluctuation and the main recruit seasons are autumn and winter. The gonad maturity and sex ratio of population significantly change with seasons and growth stages and with a highest proportion of sex mature 65% in spring. Furthermore, along with the increase of the body length,the gonad maturity is increased gradually. Gonad maturity percentage is a function of binary cubic curve to the body length. Within the scope of 35~60mm of body length, the sex ratio of population approaches 1; if the body length is longer than 60mm the individuals of female are obviously less than those of male; the body length-weight relation equation of amphioxus is W=0.0012L3.32. As the body length is longer than 50mm, the reducing coefficient of amphioxus population is 0.55/cm.

     

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