Document of bibliographic reference 305981

BibliographicReference record

Type

Bibliographic resource

Type of document

Book/Monograph

Type of document

Dissertation

BibLvlCode

M

Title

Biología reproductva de Myliobatis peruvianus “raya águila” (Garman, 1913) proveniente del Puerto Salaverry, La Libertad, Perú

Abstract

Myliobatis peruvianus, locally known as “Peruvian eagle ray” is a benthopelagic ray species of temperate waters that is commercially catched in the Peruvian coast, being the only batoid with a seasonal fishing. Despite of this, there is not enough information about its biology and less about the reproduction of this species. The aim of this study was to obtain information related to the reproductive biology of M. peruvianus from the port of Salaverry (La Libertad). Monthly samplings were made of the fishing landings of this species during October 2017 to November 2018, achieving a total of 160 specimens. Data of disc width (DW), weight, sex and clasper calcification were obtained and liver and gonads were collected. Sexual maturity was determined comparing clasper length and calcification in males and in females by comparing gonadal structure, for corroboration histological samples processed in paraplast and with haematoxylin-eosin staining were taken. 80 males (41–153 cm DW) and 80 females (42–221.6 cm DW) were obtained finding a 1:1 sex ratio. Average ovarian fecundity was 32 oocytes and average size-at-maturity was estimated in 163 cm and 122 cm DW for males and females respectively. Mature ovaries were sampled only during the second half of each year. The anatomy of gonads is described and no embryos were found. Since minimum capture sizes are based on the average estimated size-at-maturity, the reproductive aspects studied may help in the decision making for better management, a sustainable exploitation and the conservation of the fishery of this species.

Bibliographic citation

Valderrama Herrera, M.A. (2019). Biología reproductva de Myliobatis peruvianus “raya águila” (Garman, 1913) proveniente del Puerto Salaverry, La Libertad, Perú. MSc Thesis. Universidad Nacional de Trujillo, Facultad de Ciencias Biólogicas: Trujillo. 126 pp.

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open access

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