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The influence of climatic and lunar drivers on landings cycles of the temperate Australian sciaenid (Atractoscion atelodus) at two temporal scales: A working hypothesis for future management of this resource
Marine Environmental Research ( IF 3.0 ) Pub Date : 2021-08-26 , DOI: 10.1016/j.marenvres.2021.105456
John Stewart 1 , Anne-Marie Hegarty 2 , William Gladstone 3
Affiliation  

Commercial line-fishing catch rates of the endemic sciaenid Atractoscion atelodus in eastern-Australia were significantly affected by lunar phase. Periodic regression analysis indicated that catch rates were greatest during the full moon period and lowest during the new moon period. It is hypothesized that this observation is the result of the visual nocturnal feeding nature of A. atelodus, with schools of fish using the increased ambient light in the water column during the brighter part of the lunar phase to feed intensively. Increased feeding intensity during the brighter phase of the lunar month may also be related to spawning activity during the new moon phase; however this hypothesis remains to be tested. Annual commercial landings through a 71 year dataset (1950–2020) showed an approximately exponential decline, overlaid with periodic years of higher and lower landings. Such periods of higher landings were significantly positively correlated with coastal rainfall two and three years earlier, but not with rainfall in the same year or one, four or five years earlier. We hypothesize that increased coastal rainfall, likely in combination with unknown co-occurring factors, promotes increased recruitment success of A. atelodus, potentially through increased primary productivity in the nearshore marine environment. This translates into an increase in the fishable stock mainly two and three years later. If our hypothesis is correct, climate predictions of reduced rainfall in eastern Australia suggest a pessimistic outlook for this fishery.



中文翻译:

气候和月球驱动因素在两个时间尺度上对温带澳大利亚 sciaenid (Atractoscion atelodus) 着陆周期的影响:该资源未来管理的工作假设

澳大利亚东部地方性sciaenid Atractoscion atelodus 的商业钓鱼捕获率受到月相的显着影响。周期性回归分析表明,捕捞率在满月期间最高,在新月期间最低。假设这一观察结果是A. atelodus的视觉夜间进食性质的结果,在月相较亮的部分,鱼群利用水柱中增加的环境光进行密集捕食。农历较亮阶段的摄食强度增加也可能与新月阶段的产卵活动有关;然而,这个假设还有待检验。通过 71 年数据集(1950-2020)的年度商业上岸量显示出近似指数下降,并与较高和较低上岸量的周期性年份重叠。这种上岸率较高的时期与两三年前的沿海降雨量呈显着正相关,但与同年或前一、四或五年的降雨量没有显着正相关。我们假设沿海降雨量增加,可能与未知的共同发生因素相结合,促进了A. atelodus,可能是通过提高近岸海洋环境的初级生产力。这主要在两年和三年后转化为可捕捞种群的增加。如果我们的假设是正确的,澳大利亚东部降雨量减少的气候预测表明该渔业前景悲观。

更新日期:2021-08-30
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