Survival of purebred and hybrid Serrasalmidae under low water temperature conditions

Autor(es)

Fernandes, Erica Machado ^[1] ; Ferreira de Almeida, Luis Carlos ^[2] ; Hashimoto, Diogo Teruo ^[1] ; Lattanzi, Gabriel Rinaldi ^[2] ; Gervaz, Washington Rocha ^[2] ; Leonardo, Antonio Fernando ^[3] ; Reis Neto, Rafael Vilhena ^[2]

Afiliação do(s) autor(es)

^[1] UNESP, Aquaculture Ctr CAUNESP, Access Way Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP - Brazil

^[2] State Univ Sao Paulo Julio de Mesquita Filho UNES, Campus Registro, Ave Nelson Brihi Badur 430, BR-11900000 Registro, SP - Brazil

^[3] Sao Paulo Agribusiness Technol Agcy APTA Reg Polo, Highway BR 116, Km 460, POB 122, BR-1900000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Aquaculture; v. 497, p. 97-102, DEC 1 2018.
• Citações Web of Science: 1

Resumo

The aim of the study was to evaluate the survival of Serrasalmidaes fish, pure and hybrid, during periods of low temperature. The experiment was carried out from June to August 2016 (51 days) in an aquaculture station of Sao Paulo Agribusiness Technology Agency, Brazil. A diallel crossbreeding between pacu and tambaqui was performed by artificial reproduction, generating four genetic groups: pacu (male pacu x female pacu), tambaqui (male tambaqui x female tambaqui), paqui (male tambaqui x female pacu), and tambacu (male pacu x female tambaqui). Fish were distributed in 24 experimental plots (110 fingerlings of each groups per plot) and were fed twice daily with commercial diets containing three different levels of crude protein (CP): 24%, 28% and 32%. When the water temperature showed successive decreases due to the environmental climatic conditions, the ponds were monitored daily to record the mortality. The data on number of days of life of animals were submitted to Cox multivariate regression analysis to WA the effects of the genetic group, CP levels and the interaction between the two factors. Kaplan-Meier survival curves were adjusted for factors that had a significant effect on the Cox regression analysis. The pacu group presented higher survival than other groups, regardless of the CP level in the diet. The tambaqui and paqui groups were more susceptible to environmental conditions, especially when fed a diet containing a higher level of CP. Overall, purebred pacu presented greater adaptation to the production conditions in the region where the experiment was carried out. However, if the aim is the production of hybrid fish, crosses between pacu males and tambaqui females (Tambacu) generate fish that are resistant to low temperatures. (AU)

• Processo FAPESP: 14/26339-7 - Avaliação de programas alimentares para produção de pacu Piaractus mesopotamicus, tambaqui Colossoma macropomum e seus híbridos, visando a sustentabilidade ambiental
• Beneficiário: Rafael Vilhena Reis Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular