development of a water recirculating system for bullfrog production: technological innovation for small farmers
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ID: 192927
2016
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Abstract
ABSTRACT Despite the technological progress in frog farming, issues related to the environment, biosafety, and the use of technologies that minimise environmental impacts are frequently neglected by farmers. With the goal of developing a low-cost technology for reuse and preservation of water quality, an anaerobic filtering system combined with an aerobic filtering system was implemented in the grow-out sector in the Frog Culture Research Unit at Fundação Instituto de Pesca do Estado do Rio de Janeiro (FIPERJ). The filtering system received the effluent from six pens of frogs that were populated with 362 frogs in different development phases. The efficiency of the filtering system was evaluated by an analysis of the water before and after passing through the filters. In addition to the standards of water quality, the animals' performance was also observed through monitoring rates of survival, weight gain and feed conversion ratio. The results showed the effectiveness of the filtering system by removing organic matter, on average 87%. The values of total ammonia and non-ionisable reached 1.04 and 0.004 mg/L, respectively. Also, frogs subjected to the system presented satisfactory rates of weight gain and a high survival rate (97%).
| Reference Key |
mello2016cinciadevelopment
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|---|---|
| Authors | ;Sílvia Conceição Reis Pereira Mello;Roberto Rodrigues de Oliveira;Marcelo Maia Pereira;Eliane Rodrigues;Willian Nascimento Silva;José Teixeira de Seixas Filho |
| Journal | information and software technology |
| Year | 2016 |
| DOI |
10.1590/S1413-70542016000100006
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| URL | |
| Keywords | Keywords not found |
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