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首页> 外文期刊>Fisheries Research >Estimates of variability of goldband snapper target strength and biomass in three fishing regions within the Northern Demersal Scalefish Fishery (Western Australia)
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Estimates of variability of goldband snapper target strength and biomass in three fishing regions within the Northern Demersal Scalefish Fishery (Western Australia)

机译：北端解剖渔业三个渔具（西澳大利亚）三个渔场金带捕获目标强度和生物量的变异性估计

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摘要

Goldband snapper (Pristipomoides multidens) is an ecologically and economically important species in the Northern Demersal Scalefish Fishery (NDSF). The Carolina M, a trap fishing vessel operating in the NDSF, was equipped with Simrad ES70 echosounders, operated at 38 and 120 kHz. In 2014 acoustic data, in combination with optical recordings of the catch, were opportunistically collected during routine fishing operations. In December 2014 pure, low density goldband snapper schools were observed on the echograms. In situ target strength (TS) estimates were derived and linked to length distributions of catch information with the curve fitting method. Estimated TS-Length (I) at 38 kHz was 20.1 log(10)(L)-70.5 and 16.4 log(10)(L)-77 at 120 kHz. Three fishing grounds, where near simultaneously recorded acoustic and optical information was available were selected. Fish school densities observed within the 38 kHz acoustic data were disaggregated according to catch proportions using kriging. Goldband snapper density estimates ranged between 9518 individuals per nmi(2) in the high-density fishing region and 2512 and 945 individuals per nmi(2) in the two low density fishing regions. Sampling variance was estimated using geostatistics (coefficient of variance, CV = 10-20.9%). Other errors considered were signal-to-noise ratio (CV 1%), variation in the acoustic signal due to fluctuations in temperature and salinity (CV = 0.5-1.15%), effects of diurnal vertical migration and variability of catch information (CV = 1.2-2%). A total CV of 28.2-50.6% was estimated for all considered sources, for the three fishing regions.
机译：GoldBand Snapper（Pristipomoides MultiDidens）是北部过度分布式渔业（NDSF）的生态和经济上重要的物种。 Carolina M是在NDSF中运行的陷阱渔船，配备了Simrad ES70 Echosounders，以38和120 kHz为操作。在2014年，在常规捕捞业务期间，机会收集与捕获的光学记录的声学数据。在2014年12月，在回声图上观察到纯净的低密度金带鲷鱼学校。原位目标强度（TS）估计是通过曲线拟合方法的捕获信息的长度分布来实现和联系起来。 38 kHz的估计TS长度（I）是20.1对数（10）（L）-70.5和16.4 Log（10）（L）-77，120 kHz。选择了三个渔场，其中临近同时记录的声学和光学信息可用。在38 kHz声学数据中观察到的鱼学校密度根据使用Kriging的捕获比例分解。金带鲷鱼密度估计在高密度捕捞区的每NMI（2）中的9518个个体之间，在两个低密度捕捞区域中每NMI（2）的2512和945个个体。使用地统计仪（方差系数，CV = 10-20.9％）估计采样方差。考虑的其他误差是信噪比（CV <1％），声音信号的变化由于温度和盐度波动（CV = 0.5-1.15％），昼夜垂直迁移的影响和捕获信息的可变性（ CV = 1.2-2％）。对于所有被认为的来源，总计28.2-50.6％的CV为三个渔场。

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