Anchoveta (Engraulis ringens) Biomass in the Peruvian Marine Ecosystem Estimated by Various Hydroacoustic Methodologies during Spring of 2019: A Recent Study | Chapter 3 | New Visions in Biological Science Vol. 8

 Between September 29 and November 15, 2019, three scientific research vessels from the Peruvian Marine Research Institute (Instituto del Mar del Peru, IMARPE), the R/V José Olaya Balandra, the R/V Flores Portugal, and the R/V Humboldt, conducted the Hydroacoustic Pelagic Resources Assessment survey (Cruise 1909-11) along the Peruvian coast (03°23'S-18°21'S). Based on the acoustic data gathered by the three scientific vessels, we evaluated anchoveta biomass using seven hydroacoustic techniques. In the processing and subsequent analysis of the eco-acoustic records for the frequencies of 120 and 38 kHz, we used three types of techniques: stratification by isoparalitoral areas, stratification by transects, and stratification by geostatistics. The three best anchoveta biomass estimates were 8.37 million tonnes obtained using the method of stratification by isoparalitoral areas using the 120 kHz acoustic frequency data; 8.47 million tonnes obtained using the transect stratification technique using data from the 38 kHz frequency; and 8.22 million tonnes obtained using the geostatistical delta method using the 120 kHz frequency data, with coefficients of variation of 5.44 percent, 13.71 percent, and 33.21 percent, respectively. The size distribution, the length-weight relationship of the anchovy obtained in the survey 1909-11, and the use of the Target Strength (TS) equations all received special attention because of the large impact these variables can have on population biomass estimates regardless of the hydroacoustic technique used. We conclude that the anchoveta population in the Peruvian maritime ecosystem is numerous and healthy, while its abundance and, in particular, its distribution pattern, may be affected by climatic events.

Author(S) Details

Pedro Ramiro Castillo
Instituto del Mar del Perú (IMARPE), Esq. Gamarra & General Valle s/n, Chucuito, Callao, Peru.

Luis La Cruz Aparco
Instituto del Mar del Perú (IMARPE), Esq. Gamarra & General Valle s/n, Chucuito, Callao, Peru.

Daniel Grados
Instituto del Mar del Perú (IMARPE), Esq. Gamarra & General Valle s/n, Chucuito, Callao, Peru.

Rodolfo Cornejo
Instituto del Mar del Perú (IMARPE), Esq. Gamarra & General Valle s/n, Chucuito, Callao, Peru.

Jorge Csirke
Fish Stock Assessment and Fisheries Management, Peru.

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