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Reproduction and population structure of Octopus mimus fished in a Marine Protected Area of Ecuador

Published online by Cambridge University Press:  09 May 2017

Unai Markaida ,
Luis Flores ,
Evelyn Arias  and
Elba Mora
Unai Markaida*
Affiliation:
Investigación de Recursos Bioacuáticos y su Ambiente, Instituto Nacional de Pesca, Letamendi 102 y La Ría, Guayaquil, Ecuador Laboratorio de Pesquerías Artesanales, El Colegio de la Frontera Sur (CONACyT), Av. Rancho Polígono 2A, Ciudad Industrial Lerma, 24500 Campeche, Mexico
Luis Flores
Affiliation:
Escuela de Biología, Facultad de Ciencias Naturales, Universidad de Guayaquil, Av. Raúl Gómez Lince s/n y Av. Juan Tanca Marengo (Campus Mapasingue), Guayaquil, Ecuador
Evelyn Arias
Affiliation:
Investigación de Recursos Bioacuáticos y su Ambiente, Instituto Nacional de Pesca, Letamendi 102 y La Ría, Guayaquil, Ecuador Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas (CICIMAR), Av. Instituto Politécnico Nacional s/n, Col. Playa Palo de Santa Rita, 23096 La Paz, BCS, México
Elba Mora
Affiliation:
Investigación de Recursos Bioacuáticos y su Ambiente, Instituto Nacional de Pesca, Letamendi 102 y La Ría, Guayaquil, Ecuador Escuela de Biología, Facultad de Ciencias Naturales, Universidad de Guayaquil, Av. Raúl Gómez Lince s/n y Av. Juan Tanca Marengo (Campus Mapasingue), Guayaquil, Ecuador
*
Correspondence should be addressed to: U. Markaida, Investigación de Recursos Bioacuáticos y su Ambiente, Instituto Nacional de Pesca, Letamendi 102 y La Ría, Guayaquil, Ecuador email: [email protected]
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Abstract

Octopus mimus is the main octopus targeted by the small-scale fishery in the Eastern Pacific. Commercial catches of octopus from the Reserva de Producción Faunística Marino-Costera Puntilla de Santa Elena (REMACOPSE) Marine Protected Area in Ecuador were sampled from July to December 2013 in order to describe the reproduction and population structure of this octopus. The 4171 sampled octopuses ranged from 56 to 250 mm in mantle length (ML) and 45 to 3178 g in body weight (BW). Mean octopus weight did not change monthly. Males were mostly mature while the majority of females were immature. Presence of some mature and a few spent females in all months sampled suggests that the population shows an extended spawning period. No spawning peak could be properly defined. Sex ratios did not significantly shift from the expected 1:1 in most samples. Females mature at a larger size (1234 g, BW; 165 mm, ML) than males (487 g BW; 114 mm ML). We recommend considering a minimum legal size of 1200 g BW. A year-long sampling programme for O. mimus should also be completed in order to detect any spawning peak.

Keywords

Octopus mimusMarine Protected AreaREMACOPSEEcuadorpopulation structurereproductive biologysize at maturityminimum legal sizefishery
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 98 , Issue 6 , September 2018 , pp. 1383 - 1389
Copyright
Copyright © Marine Biological Association of the United Kingdom 2017 

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