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Biomass and distribution of the red octopus (Octopus maya) in the north-east of the Campeche Bank

Published online by Cambridge University Press:  10 June 2019

Otilio Avendaño
Affiliation:
Centro de Investigación y de Estudios Avanzados del IPN, CP 97310, Mérida, Yucatán, México Universidad de Ciencias y Artes de Chiapas, Tonalá, Chiapas, C.P. 30500, México
Iván Velázquez–Abunader*
Affiliation:
Centro de Investigación y de Estudios Avanzados del IPN, CP 97310, Mérida, Yucatán, México
Carlos Fernández–Jardón
Affiliation:
Facultad de Ciencias Económicas y Empresariales, Universidad de Vigo, C.P. 36310, Vigo, España
Luis Enrique Ángeles–González
Affiliation:
Universidad Nacional Autónoma de México, Sisal, Yucatán, C.P. 97356, México
Alvaro Hernández-Flores
Affiliation:
Universidad Marista de Mérida, Periférico norte tablaje catastral 13941, Carretera Mérida-Progreso. C.P. 97300 Mérida, Yucatán, México
Ángel Guerra
Affiliation:
ECOBIOMAR, Instituto de Investigaciones Marinas (IIM-CSIC), C.P. 36208, Vigo, España
*
Author for correspondence: Iván Velázquez–Abunader, Email: jvelazquez@cinvestav.mx

Abstract

The regulatory framework of the red octopus (Octopus maya) fishery includes total allowable catches (TAC), which are based on studies conducted on the population that occurs in shallow waters. In fact, most of the biological studies of this species refer to the fraction of the population that occupies waters less than 30 m deep; however, O. maya can occur up to a 60 m depth. The aim of this study is to assess the stock of O. maya that occupies waters between 30 m and 60 m deep. Four research cruises were carried out during the closed and fishing seasons, from May 2016 to January 2017. An average of 29 sampling sites were surveyed in each cruise (±2 sampling sites) using a commercial vessel with a uniform sampling effort. In each sampling site, the swept area, the total number of octopuses captured, the total weight of the catch, and the individual weight of octopuses were recorded. Biomass was obtained with four methods: stratified random method, swept area method, geostatistical biomass model, and an unpublished method of weighted swept area. The four methods provided consistent results. The distribution pattern of species was in patches, although before the fishing season started it was more homogeneous. The fraction of the population that occurs between 30 m and 60 m deep consisted mostly of adult organisms, so it could be contributing significantly to the recruitment of the entire population, even to the fraction that is exploited.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2019 

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