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Patterns in abundance and size of sharks in northwestern Australia: cause for optimism

机译:澳大利亚西北部鲨鱼的数量和大小格局:乐观的原因

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Reliable information for population assessments is rare for sharks. We quantified patterns in catch rates and mean size for numerous tropical and subtropical species from 15 years of fishery-independent surveys (2002-2017) in northwestern Australia. This study region represents an area of similar to 0.8 million km(2) which was closed to commercial shark fishing from 1993 or 2005 onward due to the very high State-wide catches of sandbar (Carcharhinus plumbeus) and dusky (Carcharhinus obscurus) sharks. A total of 43 shark and ray species were sampled, with sandbar shark being the most commonly caught species, followed by milk (Rhizoprionodon acutus), spot-tail (Carcharhinus sorrah), tiger (Galeocerdo cuvier), blacktip (Carcharhinus limbatus and Carcharhinus tilstoni), dusky and sliteye (Loxodon macrorhinus) sharks, and scalloped hammerhead (Sphyrna lewini). For sandbar shark, catch rates increased between 2008 and 2017 whereas for other taxa catch rates were mostly stable (albeit fluctuating). Mean size at capture fluctuated across years with no particular trends. Unlike for other parts of the world, catch rates and mean size of northwestern Australian sharks have been stable or increased in recent years. Though most shark species have conservative life histories, when science, management and enforcement work synergistically, sustainable resource use, recovery and conservation outcomes can all be achieved.
机译:鲨鱼很少有可靠的人口评估信息。我们通过15年的独立于澳大利亚西北部的渔业调查(2002年至2017年)量化了许多热带和亚热带物种的捕获率和平均大小的模式。该研究区域的面积约80万平方公里(2),由于全州范围内很高的沙洲(Carcharhinus plumbeus)和昏暗(Carcharhinus obscurus)鲨鱼捕捞量较高,因此从1993年或2005年开始禁止商业性鲨鱼捕捞。总共采样了43种鲨鱼和鱼,其中沙洲鲨是最常见的物种,其次是牛奶(Rhizoprionodon acutus),斑尾(Carcharhinus sorrah),老虎(Galeocerdo cuvier),blacktip(Carcharhinus limbatus和Carcharhinus tilstoni) ),昏暗的鲨鱼(Loxodon macrorhinus)和扇贝的锤头鲨(Sphyrna lewini)。沙bar鲨的捕捞率在2008年至2017年期间有所增加,而其他类群捕捞率则基本保持稳定(尽管有波动)。捕获的平均大小随年份波动,没有特定趋势。与世界其他地区不同,近年来,澳大利亚西北部鲨鱼的捕获率和平均大小一直稳定或增加。尽管大多数鲨鱼物种都有保守的生活史,但是当科学,管理和执法协同工作时,可持续的资源利用,恢复和保护成果都可以实现。

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