Stable isotopes of C and N as dietary indicators of Nile tilapia (Oreochromis niloticus) cultivated in net cages in a tropical reservoir
The relative contribution of natural feed sources and commercial diets to the nutrition of Nile tilapia (Oreochromis nilloticus) was evaluated in a net cage production carried out in a reservoir in the semi-arid northeast region of Brazil. The present study tested the hypothesis that tilapia uses na...
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Elsevier
2020-11-01
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| Series: | Aquaculture Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352513420305482 |
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| author | Cyntia Rafaela Ferreira de Moraes José Luiz de Attayde Gustavo Gonzaga Henry-Silva |
| author_facet | Cyntia Rafaela Ferreira de Moraes José Luiz de Attayde Gustavo Gonzaga Henry-Silva |
| author_sort | Cyntia Rafaela Ferreira de Moraes |
| collection | DOAJ |
| description | The relative contribution of natural feed sources and commercial diets to the nutrition of Nile tilapia (Oreochromis nilloticus) was evaluated in a net cage production carried out in a reservoir in the semi-arid northeast region of Brazil. The present study tested the hypothesis that tilapia uses natural sources of feed for growth, even when confined in cages and artificial feed resources are available. The fish and various feed sources (commercial feed, seston and periphyton) were sampled and the water quality was monitored during the cultivation, which was carried out for 120 days. The fish were fed three times daily with two commercial feeds of 40 and 32 % crude protein, both of which used fish meal as a protein source. Stable isotopes analyses were carried out by measuring the 13C and 15N of fish muscle tissue and the feed items using the MixSIAR mixing model to determine the relative contribution of the nutrient sources to fish growth. The tilapia showed adequate weight gains with the total contributions of the feed items: periphyton (14.4 %), seston (51.2 %) and commercial feed (34.4 %) throughout the 120 days of culture. It can be concluded that the natural feed sources of seston and periphyton contributed more to the growth of the Nile tilapia than the commercial feed when cultivated in net cages, changing the notion that the commercial feed contributes predominantly to the intensive farming of this species in cages. The results of the present study suggest a more sustainable feed management in the farming of Nile tilapia in net cages. |
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| institution | Directory Open Access Journal |
| issn | 2352-5134 |
| language | English |
| last_indexed | 2024-12-10T10:32:42Z |
| publishDate | 2020-11-01 |
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| record_format | Article |
| series | Aquaculture Reports |
| spelling | doaj.art-ac58c65c22a743cfbeae06292938cdc52022-12-22T01:52:32ZengElsevierAquaculture Reports2352-51342020-11-0118100458Stable isotopes of C and N as dietary indicators of Nile tilapia (Oreochromis niloticus) cultivated in net cages in a tropical reservoirCyntia Rafaela Ferreira de Moraes0José Luiz de Attayde1Gustavo Gonzaga Henry-Silva2Programa de Pós-Graduação em Ciências Marinhas Tropicais (PPGCMT), Instituto de Ciências do Mar - LABOMAR, Universidade Federal do Ceará - UFC, Av. da Abolição, 3207, Meireles, Fortaleza/CE, CEP: 60165-081, Brazil; Corresponding author.Departamento de Ecologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte (UFRN), Av. Senador Salgado Filho 3000, Lagoa Nova, Natal, RN, CEP: 59064-741, BrazilDepartamento de Biociências, Centro de Ciências Biológicas e da Saúde, Universidade Federal Rural do Semi-Árido (UFERSA), Av. Francisco Mota, 572, Bairro: Costa e Silva, Mossoró, RN, CEP: 59625-900, BrazilThe relative contribution of natural feed sources and commercial diets to the nutrition of Nile tilapia (Oreochromis nilloticus) was evaluated in a net cage production carried out in a reservoir in the semi-arid northeast region of Brazil. The present study tested the hypothesis that tilapia uses natural sources of feed for growth, even when confined in cages and artificial feed resources are available. The fish and various feed sources (commercial feed, seston and periphyton) were sampled and the water quality was monitored during the cultivation, which was carried out for 120 days. The fish were fed three times daily with two commercial feeds of 40 and 32 % crude protein, both of which used fish meal as a protein source. Stable isotopes analyses were carried out by measuring the 13C and 15N of fish muscle tissue and the feed items using the MixSIAR mixing model to determine the relative contribution of the nutrient sources to fish growth. The tilapia showed adequate weight gains with the total contributions of the feed items: periphyton (14.4 %), seston (51.2 %) and commercial feed (34.4 %) throughout the 120 days of culture. It can be concluded that the natural feed sources of seston and periphyton contributed more to the growth of the Nile tilapia than the commercial feed when cultivated in net cages, changing the notion that the commercial feed contributes predominantly to the intensive farming of this species in cages. The results of the present study suggest a more sustainable feed management in the farming of Nile tilapia in net cages.http://www.sciencedirect.com/science/article/pii/S2352513420305482Tilapia cultureNutritionEnvironmental sustainabilityCarbonNitrogen |
| spellingShingle | Cyntia Rafaela Ferreira de Moraes José Luiz de Attayde Gustavo Gonzaga Henry-Silva Stable isotopes of C and N as dietary indicators of Nile tilapia (Oreochromis niloticus) cultivated in net cages in a tropical reservoir Aquaculture Reports Tilapia culture Nutrition Environmental sustainability Carbon Nitrogen |
| title | Stable isotopes of C and N as dietary indicators of Nile tilapia (Oreochromis niloticus) cultivated in net cages in a tropical reservoir |
| title_full | Stable isotopes of C and N as dietary indicators of Nile tilapia (Oreochromis niloticus) cultivated in net cages in a tropical reservoir |
| title_fullStr | Stable isotopes of C and N as dietary indicators of Nile tilapia (Oreochromis niloticus) cultivated in net cages in a tropical reservoir |
| title_full_unstemmed | Stable isotopes of C and N as dietary indicators of Nile tilapia (Oreochromis niloticus) cultivated in net cages in a tropical reservoir |
| title_short | Stable isotopes of C and N as dietary indicators of Nile tilapia (Oreochromis niloticus) cultivated in net cages in a tropical reservoir |
| title_sort | stable isotopes of c and n as dietary indicators of nile tilapia oreochromis niloticus cultivated in net cages in a tropical reservoir |
| topic | Tilapia culture Nutrition Environmental sustainability Carbon Nitrogen |
| url | http://www.sciencedirect.com/science/article/pii/S2352513420305482 |
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