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Gonzalez-Acosta A.F.,National Polytechnic Institute of Mexico | Castro-Aguirre J.L.,National Polytechnic Institute of Mexico | Didier D.A.,Millersville University of Pennsylvania | Velez-Marin R.,Centro Regional Of Investigacion Pesquera | Burnes-Romo L.A.,National Polytechnic Institute of Mexico
Revista Mexicana de Biodiversidad | Year: 2010

The southeastern Pacific chimaeroid Hydrolagus macrophthalmus De Buen, 1959, is reported for the first time in the northeastern Pacific on the basis of 1 male specimen (945 mm TL) caught on 13 April 1995 off Manzanillo, Colima (Mexico: 18° 30′N, 104° 15′W) at the surface above deep water (2 000 m). The first occurrence of this species increases the number of chimaeroid species known in the northeastern Pacific and expands their known range. Source

Velez-Arellano N.,National Polytechnic Institute of Mexico | Garcia-Dominguez F.A.,National Polytechnic Institute of Mexico | Lluch-Cota D.B.,National Polytechnic Institute of Mexico | Gutierrez-Gonzalez J.L.,Centro Regional Of Investigacion Pesquera | And 2 more authors.
Journal of Shellfish Research | Year: 2016

This article describes the changes in the concentration of lipids, proteins, and carbohydrates in the gonad, digestive gland, foot and mantle of Haliotis fulgens over a reproductive cycle. An average of 30 specimens was collected each month between September 2011 and August 2013 from La Bocana, Baja California Sur, Mexico. The biometrics of each specimen were recorded, and gonads were processed using a standard histological method. Additionally, from February 2012 to February 2013, portions of nonfixed organs were frozen at -54°C for use in proximal analyses. This species showed gonadal development and spawning throughout the study period, with a peak in spawning from September through February, coinciding with sea surface temperatures near 20°C and the beginning of the decline in daylight. This study demonstrates that this species utilizes proteins, lipids, and carbohydrates stored in the foot during gonadal development and that lipid levels decrease in both the digestive gland and the gonad during spawning. Source

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. Source

Schneller A.J.,Skidmore College | Fernandez De Lara V.C.,Centro Regional Of Investigacion Pesquera | Zavala C.A.S.,National Polytechnic Institute of Mexico | Rebollo A.M.,National Polytechnic Institute of Mexico
Hidrobiologica | Year: 2014

Between January and August of 2010 the southwestern side of the Baja California peninsula in Baja California Sur, Mexico experienced a temporary intense growth of jumbo squid (Dosidicus gigas). We documented the resulting fishery phenomenon by conducting interviews with 110 artisanal fishermen in the community of Puerto San Carlos using a structured paper interview instrument that employed qualitative research methods to better understand the economic, demographic, and geographical catch and fleet characteristics of this fishery. We also conducted six semi-structured interviews with seafood buyer-exporters. Data show that squid fisherman temporarily migrated to Puerto San Carlos from Santa Rosalia, B. C. S., Sonora, and Sinaloa where the artisanal jumbo squid fishery is rooted. Fishermen from Puerto San Carlos, Adolfo López Mateos, and various inland B. C. S. communities found economic opportunity in the abundance of squid near Magdalena Bay. The Catch Per Unit Effort was 0.57 (+/-0.29) t of squid per day, limited only by the size of boats. Product exporters paid as much as 6 mexican pesos/kilo ($0.50 USD) at the onset of the fishery in January and February, and prices lowered to 2.5-3.0 mexican pesos/kilo ($0.25 USD) during summer months. This research also identified the shipping routes of squid from Mexico to Asian markets. Official fisheries data gathered by SAGARPA showed that Puerto San Carlos' artisanal squid fleet caught and exported 19,208 metric t of squid in 2010, representing $4.8 million USD. Source

Rabago-Quiroz C.H.,University of Sonora | Valdez-Holguin J.E.,University of Sonora | Nevarez-Martinez M.O.,Centro Regional Of Investigacion Pesquera | Acevedo-Cervantes A.,Technological Institute of Guaymas
Marine Biology Research | Year: 2012

The assemblage of the fish species obtained as bycatch in trawl nets on the Gulf of California in 2004, 2005 and 2007 was studied. Sampling was carried out during July and August at a series of stations along the coast of Sonora. The criteria for the most important fish species caught were drawn from abundance and frequency of occurrence and weight, using various ecological indices (index of relative abundance, biological value index and index of relative importance). After identification, these species and their abundances were used to define study groups based on similarity matrices and Ward's clustering method. We analysed 125 fish hauls containing&19,000 organisms, representing 243 species (fish, crustaceans, molluscs and echinoderms). There were 28 dominant species, most notably Urobatis halleri, Synodus scituliceps, Eucinostomus argenteus, Diplectrum pacificum and Haemulopsis nitidus. Cluster analysis, based on latitude, and bathymetry showed three station groupings. The first was characterized by species from the northern region of the Gulf with a bathymetric distribution&25 m. The second was dominated by species from the central to southern region from depths<25 m. The third was a transitional group with species found between the central and southern Gulf from depths of 10 to 45 m. Most fish assemblages consist of species with wide distribution within distinct biogeographic provinces, which showed a major change in the association, frequency and absence of species from north to south, indicating a variety of habitats in the Gulf of California. © 2012 Copyright Taylor and Francis Group, LLC. Source

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