Manual de manejo de reproductores y producción de huevos de lenguado negro Paralichthys orbignyanus.
In this manual the techniques applied in the handling of captive black flounder (Paralichthys orbignyanus) broodstock at the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) are presented. It includes catching of wild specimens, their conditioning to controlled environments, feeding and induced spawning by means of photoperiod and temperature control. Under controlled conditions the reproductive peak of the species took place from October through February, with a 19-22 °C temperature range and 14 h light photoperiod. In those conditions spontaneous spawnings with viable eggs (23.9-80.9 percent) released at a 1-3 day frequency were registered. Spontaneous spawnings result in a better production of eggs and larvae than that obtained through abdominal rubdown. The supply of fresh squid as the main food item would contribute to reproduction success in terms of number and quality of eggs. Females of an average weight lower than 2.9 kg would produce eggs at a fertilization rate 50 percent. The maximum fecundity of those kept under controlled conditions would be 300,000-580,000 total eggs/female/reproductive season. Egg diameter, fertilization and hatching rates and larval length are considered useful criteria to determine the quality of eggs and larvae produced by the species. Ultrasound proved to be an easy to apply, fast and non-invasive tool to determine specimens sex and females maturity stage. Sex differentiation, direct in adult individuals, allowed to distinguish, in females, gonads shaped as two greyish granular ovoid masses and, in males, of a smaller and darker appearance.
| Main Authors: | , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Spanish / Castilian |
| Published: |
2017
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| Subjects: | Reproducción, Alimentación, Huevos de peces, Cultivo de peces, Huevos, Acuicultura marina, Paralichthyidae, Paralichthys orbignyanus, Lenguado, ASFA_2015::R::Reproduction, ASFA_2015::F::Feeding, ASFA_2015::F::Fish eggs, ASFA_2015::F::Fish culture, ASFA_2015::E::Eggs, ASFA_2015::M::Marine aquaculture, |
| Online Access: | http://hdl.handle.net/1834/10993 |
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| Summary: | In this manual the techniques applied in the handling of captive black flounder (Paralichthys orbignyanus) broodstock at the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) are presented. It includes catching of wild specimens, their conditioning to controlled environments, feeding and induced spawning by means of photoperiod and temperature control. Under controlled conditions the reproductive peak of the species took place from October through February, with a 19-22 °C temperature range and 14 h light photoperiod. In those conditions spontaneous spawnings with viable eggs (23.9-80.9 percent) released at a 1-3 day frequency were registered. Spontaneous spawnings result in a better production of eggs and larvae than that obtained through abdominal rubdown. The supply of fresh squid as the main food item would contribute to reproduction success in terms of number and quality of eggs. Females of an average weight lower than 2.9 kg would produce eggs at a fertilization rate 50 percent. The maximum fecundity of those kept under controlled conditions would be 300,000-580,000 total eggs/female/reproductive season. Egg diameter, fertilization and hatching rates and larval length are considered useful criteria to determine the quality of eggs and larvae produced by the species. Ultrasound proved to be an easy to apply, fast and non-invasive tool to determine specimens sex and females maturity stage. Sex differentiation, direct in adult individuals, allowed to distinguish, in females, gonads shaped as two greyish granular ovoid masses and, in males, of a smaller and darker appearance. |
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