Field-induced breeding of the dorado,Salminus maxillosus Valenciennes |
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| Institution: | 1. Witold Stefański Institute of Parasitology, Polish Academy of Sciences, 00-818 Warsaw, Twarda 51/55, Poland;2. Department of Parasitology, Institute of Genetics and Microbiology, Wrocław University, 51-148 Wrocław, Przybyszewskiego 63/77, Poland;1. Postgraduate Degree in Aquaculture and Sustainable Development, Universidade Federal do Paraná, Palotina, PR, Brazil;2. Faculty of Agricultural Sciences, Universidade Federal da Grande Dourados, Dourados, MS, Brazil;3. Department of Animal Science, Universidade Estadual de Maringá, Maringá, PR, Brazil;4. Department of Animal Science, Universidade Estadual de Londrina, Londrina, PR, Brazil;5. Center of Engineering and Exact Sciences, Universidade Estadual do Oeste do Paraná, Toledo, PR, Brazil;1. Centro de Aquicultura da UNESP – CAUNESP, Universidade Estadual Paulista – UNESP, Via de Acesso Prof. Paulo Donato Castellane, S/N, 14884-900 Jaboticabal, SP, Brazil;2. Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista – UNESP, Distrito de Rubião Júnior, S/N, 18618-970 Botucatu, SP, Brazil;3. Reproductive Biology Group, Division of Developmental Biology, Department of Biology, Faculty of Sciences, Utrecht University, Kruyt Building, Room W-606, Padualaan 8, NL-3584 CH Utrecht, The Netherlands;4. Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo – USP, Rua do Matão, Travessa 14, n.321, Sala 220 Cidade Universitária, 05508-900 São Paulo, SP, Brazil;5. Depto de Química e Ciências Ambientais, Universidade Estadual Paulista – UNESP, Rua Cristóvão Colombo, n.2265, Jardim Nazareth, 15054-000 São José do Rio Preto, SP, Brazil |
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| Abstract: | Induced breeding of the dorado was performed using broodfish held at capture sites near the river shore. Prochilodus platensis pituitary glands (Pit) and human chorionic gonadotropin (HCG) were used as stimulators of ovarian maturation and ovulation. Positive results, with the production of viable larvae, were obtained with single injections of 1 Pit/kg and with multiple injections of 0.5, 0.25 or 0.125 Pit/kg at 2.5-h intervals. Females ovulated after receiving between 0.5 and 1 Pit/kg. During the time period covered by the experiments the percentage of ovulatory responses improved from 36% in December to 86% in February.The threshold dose that triggers final maturation and ovulation was found to be between 0.125 and 0.25 Pit/kg. Latency between injection and ovulation varied from 7 to 9 h at 23.5°C. Viability of intraovarian ovulated eggs rapidly decreased to 0% in less than 4 h at 23.5–25°C.Hatching rates ranged from 0 to 63%; the best value was obtained when eggs were stripped immediately after ovulation from a female treated with five injections of 0.125 Pit/kg at 2.5-h intervals. |
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