Artisanal fisheries and reproductive biology of the golden cownose ray, Rhinoptera steindachneri Evermann and Jenkins, 1891, in the northern Mexican Pacific

Bizzarro, Joseph J.; Smith, W.D.; Márquez‐Farías, J. Fernando; Hueter, Robert E.

doi:10.1016/j.fishres.2006.10.016

Cited by 49 publications

(40 citation statements)

References 35 publications

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“…The sex ratio among landings was evaluated using chi-square analysis with Yates correction for continuity for specimens directly examined (Zar 1996). Histograms of size and sex composition of each species with ≥50 measured individuals were computed and compared with size at maturity (taken from several scientific literature sources: , Villavicencio-Garyazar 1995, 1996a,b, Compagno 2001, Ebert 2003, Villavicencio-Garayzar and Bizzarro 2004, Perez-Jimenez et al 2005, Shoou-Jeng and HuaHsun 2005, Castillo-Geniz et al 2007, Bizzarro et al 2007a, Bejarano-Alvarez et al 2010, Carrera-Fernandez et al 2010, Hoyos-Padilla et al 2012.…”

Section: Artisanal Fishery Surveymentioning

confidence: 99%

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The artisanal elasmobranch fishery of the Pacific coast of Baja California Sur, Mexico, management implications

Ramírez‐Amaro¹,

Cartamil²,

Galván‐Magaña³

et al. 2013

Sci. Mar.

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SUMMARY: Artisanal fisheries in Mexico account for approximately 40% of the total national catch. In 2009, Baja California Sur (BCS) had the second largest catch of elasmobranchs on the Mexican Pacific coast. This paper characterizes and describes the artisanal elasmobranch fishery of Pacific coast of BCS from 2000 to 2010. Sixty artisanal camps were documented, of which 45 targeted elasmobranchs, using primarily gillnets and longlines. We identified 52 elasmobranch species. Gillnetting accounted for 73.5% of the fishing effort and most frequently captured Rhinobatos productus, Mustelus henlei and Myliobatis californica. Longline fishing accounted for 26.5% of effort, most frequently capturing Prionace glauca and Isurus oxyrinchus. The prevalence of juveniles of several species (e.g., Cephaloscyllium ventriosum, Galeorhinus galeus, Isurus oxyrinchus, and Myliobatis californica) within landings suggests that fishing effort may be opportunistically directed at breeding or nursery areas. Despite the dominance of species with wide distributions, we observed a significant biogeographic pattern in the abundance of some species relative to Bahia Magdalena. Results of the present study will be useful to detect changes in the structure of commercially exploited elasmobranch populations, and to provide useful indications for management purposes.Keywords: biogeographic pattern, elasmobranchs richness, fishing effort, Mexican coast, nursery areas, small-scale fishery.RESUMEN: Pesquería artesanal de elasmobranquios en la costa Pacifico de Baja California Sur, México, implicaciones para su gestión. -La pesquería artesanal en México soporta aproximadamente el 40% de la captura total nacional. En 2009 Baja California Sur (BCS) fue el segundo estado con mayor registro de captura de elasmobranquios de todo el Pacifico Mexicano. En el presente trabajo se realizó la caracterización y descripción de la pesquería artesanal de elasmobranquios en la costa Pacífico de BCS del 2000 al 2010. Se registraron 60 campos artesanales, de los cuales en 45 se capturaron elasmobranquios usando como artes de pesca redes y palangres. Se identificaron 52 especies de elasmobranquios. Las redes representaron el 73.5% del esfuerzo pesquero, las especies que se capturaron con mayor frecuencia fueron Rhinobatos productus, Mustelus henlei y Myliobatis californica. Por otra parte los palangres representaron el 26.5% del esfuerzo pesquero, las especies capturadas con mayor frecuencia fueron, Prionace glauca e Isurus oxyrinchus. La presencia de especímenes juveniles de varias especies en los desembarques (p. ej. Cephaloscyllium ventriosum, Galeorhinus galeus, Isurus oxyrinchus, Myliobatis californica) sugiere que el esfuerzo pesquero podría ser oportunista dirigido a las zonas de crianza o de reproducción. A pesar del dominio de especies con distribuciones amplias, se observó un patrón biogeográfico significativo en la abundancia de algunas especies al sur y al norte de Bahía Magdalena. Los resultados del presente estudio serán de utilidad para poder detectar...

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Section: Artisanal Fishery Surveymentioning

confidence: 99%

“…Several species recorded in the landings could be involved in seasonal migrations (e.g. R. productus, M. californica) (Bizzarro et al 2007a). Temperature plays an important role in the seasonal migrations of several elasmobranchs species in nearshore waters (Talent 1985, Wallman and Bennett 2006, Wiley and Simpfendorfer 2008.…”

Section: Seasonalitymentioning

confidence: 99%

The artisanal elasmobranch fishery of the Pacific coast of Baja California Sur, Mexico, management implications

Ramírez‐Amaro¹,

Cartamil²,

Galván‐Magaña³

et al. 2013

Sci. Mar.

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“…Organisms were considered mature when claspers were strongly calcified and could be easily rotated around the base (Conrath, 2005). They also had to have an extensible distal portion (Conrath, 2005) and show the presence of seminal fluid (Bizarro et al, 2007). Male bullnose ray that lacked these characteristics were considered to be immature.…”

Section: Methodsmentioning

confidence: 99%

Exploitation and reproduction of the bullnose ray (Myliobatis freminvillei) caught in an artisanal fishery in La Pared, Margarita Island, Venezuela

Tagliafico¹,

Ehemann²,

Rangel³

et al. 2016

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Abstract-Species of the genus Myliobatis have been poorly assessed because of a lack of available information regarding their capture and life history. We provide valuable data based on the commercial landings of the bullnose ray (Myliobatis freminvillei), which we studied during 2 separate time periods (October 2005-December 2007 and JanuaryDecember 2013. A total of 187 individuals were analyzed: 85 females (24.0-96.0 cm in disc width [DW]) and 102 males (22.8-118.0 cm DW). There was no difference in the overall sex ratio (females to males: 4:5); however, differences were found between the annual sex ratio in 2005, 2006, and 2013. Estimated capture per unit of effort for this species was 0.8 individuals/trip (standard deviation [SD] 1.3) or 2.9 kg/trip (SD 5.5), showing an increase in effort through time and significant differences between years. Approximately 25% of both sexes were shorter than the estimated median DW at maturity. No pattern in the reproductive cycle was identified because of the lack of landings during several months; however, mature individuals were observed frequently throughout the study period; gravid females were observed on only 2 occasions. This study provides baseline biological information on the life history of the bullnose ray for necessary fishery management.

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“…Los machos maduros fueron identificados cuando los claspers estaban completamente desarrollados, presentaban fuerte calcificación, fácil rotación en la base, extremo distal extensible (Conrath 2004) y presencia de fluido seminal (Bizzarro et al 2007). …”

Section: Materiales Y Métodosunclassified

Pesquería y biología de <i>Rhinobatos percellens</i> (Rajiformes: Rhinobatidae) capturados por la pesquería artesanal de playa La Pared, Venezuela

Tagliafico

Rago

Rangel

2013

RBT

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Fishery and biology of Rhinobatos percellens (Rajiformes: Rhinobatidae) caught by the artisanal fishery at La Pared beach, Venezuela. R. percellens is incidentally caught in Venezuela by the artisanal fishery using bottom gillnets. This species was classified by the IUCN as being "near threatened", and there is poor knowledge about its biology and fishery in Venezuela. For this reason, we analyzed the specimens caught by the artisanal fleet in playa La Pared, once a week, from January to December 2007. We determined total length, sex and maturity for each captured specimen. A total of 210 specimens were analyzed, 159 females and 51 males. The 81% of all specimens caught were adults, but within this group 27% were pregnant. The average size of sexual maturity was found between 51 and 52cm for females and males, respectively. Adult females were found all year round, and pregnant females in seven of the months sampled; highest numbers were found between February-March and September. The analyzed females had a total of 96 embryos with a size range between 2 and 19cm, with a maximum fertility of four embryos per litter. February and June-July showed the maximum breeding time, and considering the broad range of embryos sizes and the frequency of pregnant females along the different months, allow us to believe that they reproduce throughout the year. Fishing regulation including minimum catch size in relation to maturity length and release of pregnant females in water is recommended. Rev. Biol. Trop. 61 (1): 149-160. Epub 2013 March 01.

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Artisanal fisheries and reproductive biology of the golden cownose ray, Rhinoptera steindachneri Evermann and Jenkins, 1891, in the northern Mexican Pacific

Cited by 49 publications

References 35 publications

The artisanal elasmobranch fishery of the Pacific coast of Baja California Sur, Mexico, management implications

The artisanal elasmobranch fishery of the Pacific coast of Baja California Sur, Mexico, management implications

Exploitation and reproduction of the bullnose ray (Myliobatis freminvillei) caught in an artisanal fishery in La Pared, Margarita Island, Venezuela

Pesquería y biología de <i>Rhinobatos percellens</i> (Rajiformes: Rhinobatidae) capturados por la pesquería artesanal de playa La Pared, Venezuela

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