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Avila-Poveda O.H.,Catedras CONACYT | Avila-Poveda O.H.,Autonomous University of Sinaloa | Koueta N.,University of Caen Lower Normandy | Benitez-Villalobos F.,University of the Sea | And 2 more authors.
Molluscan Research | Year: 2016

ABSTRACT: Octopus maya is the main species caught in Mexico. From September 2007 to June 2008, its sex ratio, reproductive season, frequency of non-vitellogenic and vitellogenic oocytes, reproductive indices, and size and weight at maturity, were evaluated. The monthly sex ratio was significantly different from 1:1. The major reproductive season occurs during February to June (dry season) in Yucatan. May−June is the common reproductive season to both Yucatán and Campeche populations. Higher frequencies of vitellogenic oocytes (> 50%) were found from January-March and in May. From five reproductive indices, only the macroscopic and microscopic maturity indices were the best descriptors of the reproductive season in females, whilst only the reproductive complex index was the best descriptor in males. The weight at sexual maturity (BW50%) was 335 g for females and 242 g for males. The size at sexual maturity (DML50%) was 12.58 cm for females and 7.42 cm for males. It is recommend revising the minimum catch size by following these results. The reproductive traits here evaluated could contribute to the recently created Plan for Management of Octopus Fisheries, in particular action line no. 1.4, which refers to protection of females during breeding, and to their protection throughout the entire reproductive season. © 2016 The Malacological Society of Australasia and the Society for the Study of Molluscan Diversity. Source

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. Source

Cruz A.,Instituto Nacional Of Pesca Inapesca | Soriano S.R.,Instituto Nacional Of Pesca Inapesca | Santana H.,Region Pacifico Sur del INAPESCA | Ramirez C.E.,Instituto Nacional Of Pesca Inapesca | Valdez J.J.,Region Pacifico Sur del INAPESCA
Revista de Biologia Tropical | Year: 2011

Shark fishery is one of the most important activities in the Mexican Pacific coast, nevertheless, there is few data available about the specific captures done by the fleet along the coast. This study describes fishery biology aspects of the shark species catched by the semi-industrial long-line fleet of Manzanillo. Monthly samplings were made on board of these vessels during an annual period from April 2006 to April 2007. Captured species composition (n=1 962 organisms) was represented by nine species. The one that sustains this fishery was Carcharhinus falciformis (88.12%), followed by Prionace glauca (8.21%). Low frequency species were represented by Sphyrna zygaena (1.78%), Alopias pelagicus (0.82%), Carcharhinus longimanus (0.45%). Furthermore, rare species were Alopias superciliosus (0.35%), Carcharhinus leucas (0.1%), Carcharhinus limbatus (0.1%) and Isurus oxyrinchus (0.05%). Fishery activity affected principally (60-92.70%) young males of C. falciformis, S. zygaena, C. longimanus and I. oxyrinchus; adult males (56-75%) of A. pelagicus, A. superciliosus, and C. limbatus; for P. glauca there were primarily female adults. For all the species found, females showed the bigger sizes when compared to males (with the exception of S. zygaena, that showed sexual dimorphism). Considering the lineal regressions made between precaudal length and total length, and, fork length and total length for C. falciformis, P. glauca, S. zygaena and A. pelagicus, the determination coefficients (r2) showed that both lengths can be useful to obtain the total length of fish with some damage or absence of its caudal fin. The estimated fecundity for C. falciformis was of 3-7 offspring/female of 30-45cm LT (average of 40.57+2.03cm LT); and for P. glauca 5-52offspring/female of 5-18.6cm LT (average of 11.61±0.21cm LT). In the case of C. longimanus only one female was captured with a total of eight embryos, with an average of 45cm LT each; for this reason we assumed that the fishery areas do not coincide with the nursery oness for this species. According to the information obtained, we concluded that C. falciformis has a concurrent cycle and P. glauca a consecutive biannual one. Source

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