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1.东海绿鳍马面鲀产卵群体自从开发利用以来,体长、年龄和体重组成出现了两次增大两次变小的过程。即1974—1976年和1981—1983年的个体较大,1977—1980年和1984年的个体较小,而1985年的个体最小。但性腺成熟系数却在提高,表明资源的密度在降低。 2.绿鳍马面鲀不同生活阶段的性比不一样,产卵期雄鱼的比例最高,越冬期居次,索饵期雌雄比例基本相等。 3.从产卵个体、仔稚鱼和产卵盛期渔获量的分布判断东海绿鳍马面鲀的产卵场在25°30′—30°00′N、122°00′—126°30′E海区,范围较广,主要产卵场在25°45′—27°00′N、122°00′—123°30′E,水深100—120米的海区。 4.东海绿鳍马面鲀的产卵期在3月底至5月下旬,4月中下旬为产卵盛期。 5.从雌鱼性腺V_A、V_B期比例的周日变化判断绿鳍马面鲀产卵的主要时间在23时至翌日11时。 6.从绿鳍马面鲀人工授精卵附着实验的结果和产卵场环境条件的对照,说明海洋里的贝砾类、海藻、海绵体和珊瑚等物体是马面鲀卵的良好附着基。
1. Since the development and utilization of the green fins in the East China Sea, the spawning population has experienced two increases and two decreases in body length, age and weight composition. That is, individuals in 1974-1976 and 1981-1983 were larger, while individuals in 1977-1980 and 1984 were smaller, while those in 1985 were the smallest. However, the coefficient of gonadal maturity is increasing, indicating that the density of resources is decreasing. 2. Green fin noodles 性 different stages of life is not the same sex ratio, the highest proportion of male spawning period, overwintering times, the proportion of male and female during the bait period are basically equal. According to the distribution of catch of larvae, laying larvae and spawning peak, the spawning grounds of equatorial 绿 东 in the East China Sea were estimated at 25 ° 30’-30 ° 00’N, 122 ° 00’-126 ° 30’E sea area, a wide range, the main spawning ground at 25 ° 45’-27 ° 00’N, 122 ° 00’-123 ° 30’E, water depth of 100-120 meters of sea. 4. The East China Sea green fin horse spawning spawning period from the end of March to late May, mid-April for the spawning peak. Judging from the change of V_A and V_B ratio of female gonads, the main time for oviposition of the green fins is about 23 o’clock and 11 o’clock the next day. The results showed that the gravel, seaweed, cavernous and coral in the sea were good attachments to horse-faced eggs.