BIOLOGY OF TIGER SHARKS (GALEOCERDO-CUVIER) CAUGHT BY THE QUEENSLAND SHARK MESHING PROGRAM OFF TOWNSVILLE, AUSTRALIA
BIOLOGY OF TIGER SHARKS (GALEOCERDO-CUVIER) CAUGHT BY THE QUEENSLAND SHARK MESHING PROGRAM OFF TOWNSVILLE, AUSTRALIA
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DOI：
10.1071/mf9920033
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发表时间：
1992-01-01
期刊：
影响因子：
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通讯作者：
SIMPFENDORFER, C
中科院分区：
文献类型：
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作者：
SIMPFENDORFER, C
本文对1964 ~ 1986年在澳大利亚汤斯维尔海域捕获的835只居维叶角鲨进行了生物学研究。这些鲨鱼是在一个保护性的网格方案中捕获的，该方案使用了大网眼刺网和固定线。出生时的大小估计为80-90厘米的总长度，和女性成熟时约287厘米的总长度。窝仔数范围为6至56只。繁殖和幼崽似乎都发生在夏季，与女性不繁殖每年。成熟的雌性可能会在春末和夏季迁移到近海分娩。青少年和成年人的性别比例有利于女性，很少有成年男性被抓获。观察到饮食的个体发生变化，幼鱼主要以硬骨鱼、海蛇和鸟类为食，成年鱼主要以硬骨鱼、海蛇、海龟和螃蟹为食。种群数量没有明显减少。汤斯维尔地区由于长期实施保护性网栅计划而捕获鲨鱼，
The biology of 835 specimens of Galeocerdo cuvier caught between 1964 and 1986 off Townsville, Australia, was examined. The sharks were caught in a protective meshing programme using both large mesh gill-nets and set lines. The size at birth was estimated to be 80-90 cm total length, and females matured at approximately 287 cm total length. Litter sizes ranged from 6 to 56. Breeding and pupping both appear to occur in summer, with females not breeding every year. Mature females possibly migrate inshore during late spring and summer to give birth. The sex ratio of juveniles and adults favoured females, with few adult males being caught. Ontogenic changes in the diet were observed, with juveniles feeding predominantly on teleosts, sea snakes and birds and adults mostly consuming teleosts, sea snakes, turtles and crabs. There was no apparent decrease in the population size of G. cuvier in the Townsville area as a result of the long-term catching of sharks by the protective meshing programme.