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Rodhouse P.G.K.,British Antarctic Survey | Pierce G.J.,University of Aberdeen | Pierce G.J.,University of Aveiro | Sauer W.,Rhodes University | And 49 more authors.
Reviews in Fisheries Science and Aquaculture | Year: 2015

Some 290 species of squids comprise the order Teuthida that belongs to the molluscan Class Cephalopoda. Of these, about 30-40 squid species have substantial commercial importance around the world. Squid fisheries make a rather small contribution to world landings from capture fisheries relative to that of fish, but the proportion has increased steadily over the last decade, with some signs of recent leveling off. The present overview describes all substantial squid fisheries around the globe. The main ecological and biological features of exploited stocks, and key aspects of fisheries management are presented for each commercial species of squid worldwide. The history and fishing methods used in squid fisheries are also described. Special attention has been paid to interactions between squid fisheries and marine ecosystems including the effects of fishing gear, the role of squid in ecosystem change induced by overfishing on groundfish, and ecosystem-based fishery management. Copyright © Taylor & Francis Group, LLC.

Chavez E.A.,Centro Interdisciplinario Of Ciencias Marinas Ipn | de lourdes salgado-rogel M.A.,Instituto Nacional Of Pesca Inapesca | Palleiro-Nayar J.,Instituto Nacional Of Pesca Inapesca
California Cooperative Oceanic Fisheries Investigations Reports | Year: 2011

The catch of the warty sea cucumber Parastichopus parvimensis of northwestern Baja California declined since 1997 from 622 metric tons to almost one third through the last thirteen years, in a relatively stable harvest. The fishery employs 294 fishermen, with annual profits of $243,000 used. The goal of the study was to assess the stock biomass, the socioeconomic performance of the fishery, and to evaluate harvesting scenarios. A relative constancy of fishing mortality (F) and the stock biomass were observed the last thirteen years. Current profits per fisher are near the maximum the fishery can produce, which is profitable under a narrow combination of age of first catch and F. Fishermen seem to avoid unprofitable activity when fishing intensity increases, so there is an apparent tendency to reduce economic risk by exerting a low effort. Immature animals are exploited, but under the low F applied, the stock can withstand it without showing signs of depletion.

Lopez-Fuerte F.O.,Autonomous University of Baja California Sur | Siqueiros-Beltrones D.A.,Centro Interdisciplinario Of Ciencias Marinas Ipn | Hernandezzlmeida O.U.,CINVESTAV
Marine Biodiversity Records | Year: 2013

The first list of epiphytic diatom species on the seagrass Thalassia testudinum from the Yalahau lagoon area in the Mexican Caribbean is given. One hundred and seven diatom taxa living on T. testudinum were identified including species and varieties. Nine taxa are new records for Mexico. The Bacillariophyceae with 87 taxa were the most diverse group. The most abundant taxa were: Cocconeis lineata, Mastogloia crucicula var. crucicula, Cocconeis thalassiana, Cocconeis scutellum var. scutellum and Mastogloia ovata, representing approximately 75% of the total valve count (N = 1527). Yalahau lagoon samples from site 1 yielded a high number of rare taxa. Species richness (S), diversity (H′, 1-λ) and equitability (J′) for the lagoon were lower than for Cabo Catoche (site 2). Based on presence/absence of species, the measured similarity (60%) suggests that the diatom assemblages growing on T. testudinum in the two localities are different. © Marine Biological Association of the United Kingdom 2013.

Valdez-Zenil J.,University of Veracruz | Valdez-Zenil J.,Colegio de Mexico | Rodiles-Hernandez R.,Colegio de Mexico | Gonzalez-Acosta A.F.,Colegio de Mexico | And 3 more authors.
Journal of Applied Ichthyology | Year: 2014

This study examines the length-weight (L-W) and length-length (L-L) relationships, gonadosomatic indices, and size at sexual maturity for individuals of the endemic Mexican mojarra, Eugerres mexicanus (Steindachner, 1863) from the Usumacinta River Basin, Tabasco, Mexico. From April 2008 to January 2010, 360 specimens were examined, including 151 (41.9%) male, 179 (49.7%) female and 30 unsexed (8.3%) individuals. Overall female:male ratio was 1.2 : 1. Gonadosomatic index (GSI) values indicate increased reproductive activity during February, with significant differences between males (GSI = 2.07) and females (GSI = 5.48). The mean size at first maturity (L50) was 17.3 cm TL for males and 20.5 cm TL for females. © 2013 Blackwell Verlag GmbH.

Skarbnik Lopez J.,Autonomous University of Baja California Sur | Herrero Perezrul D.,Centro Interdisciplinario Of Ciencias Marinas Ipn | Reyes Bonilla H.,Autonomous University of Baja California Sur | Garcia Dominguez F.,Centro Interdisciplinario Of Ciencias Marinas Ipn | Turrubiates Morales J.,Centro Regional Of Investigacion Pesquera
Echinoderms: Durham - Proceedings of the 12th International Echinoderm Conference | Year: 2010

The reproductive cycle of Holothuria (Selenkothuria) lubrica was monitored from November 2003 to November 2004. A total of 1438 specimens were weighted and measured and the gonad of 390 individuals were preserved for the reproduction analysis. The mean length and weight were 9.69±0.070cm and 18.25 ± 0.271 g respectively. The result showed that the species grows allometrically (b = 2.072) at the study site. Five gonadal stages were described according to cell types present in the gonad: undetermined, gametogenesis, maturity, spawning and spent. Gonad index was estimated monthly and compared to gonadal stages and sea-surface temperature in order to determine if there was a relationship between these parameters. This holothurian is dioecious and sex ratio was not different from 1:1. The reproduction showed an annual pattern with a single spawning period during summer. The gonad index showed the highest values during summer, coinciding with mature gonads and when the sea-surface temperature reached its maximum. The calculated weight at first maturity was 27.3 g. © 2010 Taylor & Francis Group.

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