Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania

Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania

Black hake, Merluccius polli and M. senegalensis, are demersal species that inhabit the continental shelf and upper slope off Morocco, Mauritania, and Senegal, and are targeted by Spanish trawlers and bottom longliners. Merluccius senegalensis generally occurs at shallower depths than M. polli, alth...

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Autores principales: Fernández-Peralta, L, Salmerón, F, Rey, J, Puerto, MA, García-Cancela, R
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2011
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1841
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language eng
description Black hake, Merluccius polli and M. senegalensis, are demersal species that inhabit the continental shelf and upper slope off Morocco, Mauritania, and Senegal, and are targeted by Spanish trawlers and bottom longliners. Merluccius senegalensis generally occurs at shallower depths than M. polli, although both species share a wide bathymetric range. Due to their external resemblance and overlapping occurrence at certain depths, both species are mixed in catches and are commonly marketed as Merluccius spp. From 2003 to 2009 biological samplings were performed in Mauritanian waters for numerous specimens of M. polli and M. senegalensis during 15 commercial fishing trips, seven experimental longline surveys, and three trawl surveys carried out within the black hake depth range and mainly during their reproductive periods. Data sets for 1334 fishing stations were thus gathered. The georeferenced macroscopic analysis of the female-assigned maturity stages was combined with the monthly evolution of the gonadosomatic index and with the time series of roe landings from 1984 to 2006 to determine the potential spawning areas, depths, and seasons for both species, showing an intense spawning period from November to February. Size at first maturity was estimated for both species in separate spawning periods and was higher for M. polli females (44 cm) than for M. senegalensis females (39 cm). Sex ratios were also determined by length classes (1 cm) for the experimental survey data and were analyzed according to fishing gear and latitude. The results showed a general predominance of females throughout the depths explored, both for M. polli (1:1.7) and M. senegalensis (1:1.5). Histological samples of ovaries and spawning progression data were jointly analyzed and indicated an apparent spawning delay for the deeper hake, M. polli (October), in comparison with the shallower hake, M. senegalensis (September). 
format info:eu-repo/semantics/article
author Fernández-Peralta, L
Salmerón, F
Rey, J
Puerto, MA
García-Cancela, R
spellingShingle Fernández-Peralta, L
Salmerón, F
Rey, J
Puerto, MA
García-Cancela, R
Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania
author_facet Fernández-Peralta, L
Salmerón, F
Rey, J
Puerto, MA
García-Cancela, R
author_sort Fernández-Peralta, L
title Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania
title_short Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania
title_full Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania
title_fullStr Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania
title_full_unstemmed Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania
title_sort reproductive biology of black hakes (merluccius polli and m. senegalensis) off mauritania
publisher Iniversidad Autónoma de Baja California
publishDate 2011
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1841
_version_ 1792610711041474560
spelling repositorioinstitucional-20.500.12930-74462023-05-09T14:30:59Z Reproductive biology of black hakes (Merluccius polli and M. senegalensis) off Mauritania Biología reproductiva de las merluzas negras (Merluccius polli y M. senegalensis) en aguas de Mauritania Fernández-Peralta, L Salmerón, F Rey, J Puerto, MA García-Cancela, R Black hake, Merluccius polli and M. senegalensis, are demersal species that inhabit the continental shelf and upper slope off Morocco, Mauritania, and Senegal, and are targeted by Spanish trawlers and bottom longliners. Merluccius senegalensis generally occurs at shallower depths than M. polli, although both species share a wide bathymetric range. Due to their external resemblance and overlapping occurrence at certain depths, both species are mixed in catches and are commonly marketed as Merluccius spp. From 2003 to 2009 biological samplings were performed in Mauritanian waters for numerous specimens of M. polli and M. senegalensis during 15 commercial fishing trips, seven experimental longline surveys, and three trawl surveys carried out within the black hake depth range and mainly during their reproductive periods. Data sets for 1334 fishing stations were thus gathered. The georeferenced macroscopic analysis of the female-assigned maturity stages was combined with the monthly evolution of the gonadosomatic index and with the time series of roe landings from 1984 to 2006 to determine the potential spawning areas, depths, and seasons for both species, showing an intense spawning period from November to February. Size at first maturity was estimated for both species in separate spawning periods and was higher for M. polli females (44 cm) than for M. senegalensis females (39 cm). Sex ratios were also determined by length classes (1 cm) for the experimental survey data and were analyzed according to fishing gear and latitude. The results showed a general predominance of females throughout the depths explored, both for M. polli (1:1.7) and M. senegalensis (1:1.5). Histological samples of ovaries and spawning progression data were jointly analyzed and indicated an apparent spawning delay for the deeper hake, M. polli (October), in comparison with the shallower hake, M. senegalensis (September).  Las merluzas negras, Merluccius polli y M. senegalensis, son especies demersales que se distribuyen en la plataforma y talud continenetal de Marruecos, Mauritania y Senegal, donde son capturadas por las flotas pesqueras españolas de arrastre y palangre de fondo. Su distribución depende de la profundidad, siendo M. senegalensis una especie costera y M. polli una profunda. Debido a su gran parecido externo y su solapamiento a ciertas profundidades son desembarcadas mezcladas, registrándose estadísticamente como Merluccius spp. Entre 2003 y 2009 se llevaron a cabo muestreos biológicos de un gran número de ejemplares de M. polli y M. senegalensis en aguas de Mauritania, como parte de actividades científicas realizadas preferentemente en periodos reproductivos (15 mareas comerciales en arrastreros, 7 campañas experimentales en palangreros y 3 campañas oceanográficas de arrastre). Se muestrearon 1334 estaciones de pesca en los caladeros de ambas especies. Mediante el análisis georeferenciado de los estados gonadales de visu y de la evolución de los índices gonadosomáticos (IGS) de las hembras, así como de la serie temporal de las descargas de huevas (ovarios) entre 1984 y 2006, se determinaron las posibles zonas, profundidades y épocas de puesta de ambas especies, comprobando que ésta es intensa en las dos especies de noviembre a febrero. Se calculó por sexos y total de ejemplares de las dos especies, la talla de primera madurez (L50) en distintos momentos reproductivos, destacando la mayor L50 de las hembras de la especie profunda (44 cm) con respecto a la costera (39 cm). También se analizó la proporción de sexos por rangos de talla de 1 cm en las campañas, por arte de pesca y latitudinalmente, observando una predominancia general de hembras en las profunidades prospectadas, tanto en M. polli (1:1.7) como en M. senegalensis (1:1.5). Por último, el procesado de ovarios de las dos especies mediante técnicas histológicas de rutina, junto con los datos analizados sobre la época de reproducción, ha mostrado un aparente retraso en la puesta de la especie de aguas profundas, M. polli (octubre), con respecto a la especie costera, M. senegalensis (septiembre). 2011-03-29 2021-06-03T03:55:20Z 2021-06-03T03:55:20Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1841 10.7773/cm.v37i4B.1841 https://hdl.handle.net/20.500.12930/7446 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1841/1691 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 37 No. 4B (2011); 527-546 Ciencias Marinas; Vol. 37 Núm. 4B (2011); 527-546 2395-9053 0185-3880

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