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- W2553391042 abstract "Atlantic mackerel is a small pelagic, migratory fish which supports valuable commercial fisheries. Despite the fact that these fish school in massive numbers, and are readily detected using echosounders, fishery-independent estimates of the abundance of mackerel in the Northeast Atlantic do not yet consider acoustic data. Echo-integration surveys could provide annual estimates of abundance, with additional scope for studying mackerel distributions throughout the year. However, as in all acoustic surveys, this requires accurate estimates of target strength (TS). The present study provides in situ TS estimates for mackerel from measurements made at sea with a multi-frequency split-beam echosounder. Empirical results suggest mean TS of -51.22 dB at 18 kHz, -59.83 dB at 38 kHz, -55.51 dB at 120 kHz, and -53.43 dB at 200 kHz, for a mean fish length of 33.3 cm. These differ significantly from the values currently used in acoustic surveys. The sensitivity of mackerel abundance estimates to variations in TS estimates was investigated using data from a dedicated mackerel acoustic survey. Total stock biomass estimates at 38 and 200 kHz were in very good agreement with each other (to within 2.2%) and were in the range of values from an independent (i.e., non-acoustic) mackerel stock assessment. It is recommended that future acoustic estimates of mackerel are based on integration at 200 kHz." @default.
- W2553391042 created "2016-11-30" @default.
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- W2553391042 date "2016-10-01" @default.
- W2553391042 modified "2023-10-14" @default.
- W2553391042 title "Effects of target strength variability on estimates of abundance: The case of Atlantic mackerel (Scomber scombrus)" @default.
- W2553391042 doi "https://doi.org/10.1121/1.4970261" @default.
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