Effect of Water Temperature on Reproductive Tract Condition of Penaeus setiferus Adult Males |
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Authors: | Cristina Pascual Evangelina Valera Cristina Re-Regis Gabriela Gaxiola Adolfo Sanchez Laida Ramos Luis A. Soto Carlos Rosas |
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Affiliation: | Laboratorio de Ecofsiologia, Departmento de Biologia, Facultad de Ciencias, Universidad Nacional Autónoma México, Apartado Postal 69, Ciudad del Carmen, Campeche, México;Centro Regional de Investigaciones Pesqueras de Lerma, Campeche, INP, SEMARNAP, México;Laboratorio de Ecofisiologia, Departmento de Biologia, Facultad de Ciencias, Universidad Nacional Autónoma México, Apartado Postal 69, Ciudad del Carmen, Campeche, México;Centro de Investigaciones Marinas, Avenida la, No. 2808, Miramar, La Habana, Cuba;Laboratorio de Ecología del Bentos, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma México, México 04510, D.F. México;Laboratorio de Ecofsiologia, Departmento de Biologia, Facultad de Ciencias, Universidad Nacional Autónoma México, Apartado Postal 69, Ciudad del Carmen, Campeche, México |
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Abstract: | Abstract— This study was conducted to determine the effect of water temperature on male reproductive tract degenerative syndrome (MRTDS) and male reproductive system melanization (MRSM) in Penaeus setiferus , and to evaluate the effect of water temperature on spermatophore regeneration time and sperm quality in electrically ejaculated adult males. Variation in sperm quality, gonadosomatic index, and histological changes in the reproductive system were used to assess reproductive tract changes in the first experiment. Sperm quality and regeneration time were measured before and after successive regenerations in the second experiment. Sperm quality was stable when shrimp were held at 26 C for 30 d but was reduced when shrimp were held at 30 C. Reproductive tissues of 20% of the shrimp held at 30 C were melanized to some degree but tissue melanization was found in only 2.5% of the shrimp held at 26 C. Spennatophore regeneration time was also affected by temperature. Average times for first spermatophore regeneration were 192 h at 25 C, 152 h at 30 C, and 144 h at 33 C. Sperm quality of regenerated shrimp was not affected at 25 C but was reduced for regenerated animals held at 33 C. Based on these results, we recommend a water temperature between 25 and 27 C to obtain adequate spermatophore regeneration and to maintain healthy male P. setiferus broodstock for at least 30 d. |
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