Zoology Department, The University of Melbourne, Parkville 3010, Victoria, Australia.
J Fish Biol. 2010 Nov;77(7):1564-78. doi: 10.1111/j.1095-8649.2010.02788.x. Epub 2010 Oct 15.
A rapid semi-quantitative ecological risk assessment method (productivity and susceptibility analysis) indicated that, despite its low biological productivity, the Port Jackson shark Heterodontus portusjacksoni is at low risk to all fishing methods in far-eastern Victoria, Australia, under the present fishing practices, because of its low catch susceptibility. The risk to this population, however, would increase if the shark gillnet fishery operating in the region were to retain the species as a by-product. Demographic analysis indicated that the species has medium intrinsic population growth rate and potential rebound in comparison with other chondrichthyan species, juveniles have higher elasticity than mature females and both juvenile and mature females have higher elasticities than hatchlings. Because of its low biological productivity and moderate resilience to the effects of fishing, cautious management measures will be necessary to ensure the sustainable use of H. portusjacksoni if its marketing increases in the future. Information on the dynamics of a population that is valuable to provide management advice can be obtained through demographic methods, but rapid assessment methods can also provide complementary information on the effects of fishing by considering the catch susceptibility of the population to each fishing method.
一种快速半定量生态风险评估方法（生产力和易感性分析）表明，尽管澳大利亚远东区杰克逊港鲨鱼 Heterodontus portusjacksoni 的生物生产力低，但由于其被捕捞的易感性低，在目前的捕捞方式下，该鱼种对所有捕捞方式的风险都较低。然而，如果在该地区作业的鲨鱼刺网渔业将该鱼种作为副渔获物保留，该种群的风险将会增加。种群分析表明，与其他软骨鱼类相比，该物种具有中等的内在种群增长率和潜在的反弹能力，与成熟雌性相比，幼鱼的弹性更高，而幼鱼和成熟雌性的弹性均高于幼仔。由于其生物生产力低，对捕捞影响的恢复能力适中，如果未来其市场需求增加，需要采取谨慎的管理措施来确保 H. portusjacksoni 的可持续利用。通过人口统计学方法可以获得对提供管理建议有价值的种群动态信息，但通过考虑种群对每种捕捞方式的捕捞易感性，快速评估方法也可以提供有关捕捞影响的补充信息。
