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Parâmetros de crescimento de achigãs (Micropterus salmoides, Lacépède, 1802) alimentados com Eisenia fetida (Savigny, 1826)
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Abstract(s)
O achigã (Micropterus salmoides Lacépède, 1802) é uma espécie piscícola de águas interiores com elevado interesse gastronómicoemPortugal. A Eisenia fetida (Savigny, 1826) é uma boa fonte de proteínapara utilizar na alimentação animal.No entanto, obaixo teor em matéria seca (19,03%) e os elevados teores em fibra bruta (5,83%) e em cinzas (10,70%),principalmente terra, poderão ser um fator limitante à sua utilização como alimento para peixescarnívoros. Com o objetivo de avaliar o interesse da utilização de E. fetidana alimentação de peixes, em setembro foram capturados 22 juvenis de achigã (0+ anos) numa pequena barragem de rega (N 39º49’27,89’’; O 07º26’57,92’’). Os achigãs foram colocados em três tanquespara habituação a um alimento composto comercial.
Como em Portugal não se produzem alimentos compostos específicos para achigãs foi utilizado um alimento composto comercial formulado para douradas (Sparus aurata Linnaeus, 1758) e robalos (Dicentrarchus labrax Linnaeus,1758) (proteína bruta 49,74%MS e gordura bruta 18,07%MS). Ao fim de trêssemanas,86,4% dos peixes já ingeriam o alimentosólido. Não foi necessária habituação à E. fetidauma vez que faz parte da alimentação natural do achigã. Em 13 outubro, dos 22 achigãs iniciaisforam selecionadosaleatoriamente 16 que foramcolocados em dois tanques(8 peixes/tanquecom0,048m3de água). No tanqueG1 (E. fetida) e tanqueG2 (alimento granulado) o peso, o comprimento, o fator K e a densidade iniciais foram, respetivamente, 13,62g e 13,40g (p>0,05); 10,49cm e 10,39cm (p>0,05); 1,160 e 1,179 (p>0,05); 2,27kg/m3e 2,23kg/m3. Durante o ensaio,com duração de 179 dias, a temperatura média da água variou entre 17,1ºC e 24,5ºCe a taxa de sobrevivência foi de 100%.No dia 179 do ensaio,os valores médios de peso, comprimento, fator K e produtividade nos tanques G1 e G2 foram, respetivamente, 31,54 g e 40,87 g (p<0,05); 13,01 cme 14,28 cm (p<0,05); 1,410e 1,388(p>0,05); 5,25 kg/m3e 6,80 kg/m3. Os resultados obtidos parecem indicar que a E. fetidapode ser utilizada na alimentação de achigãs.
Abstract: The largemouth bass (Micropterus salmoidesLacépède,1802) is an inland fish species that is of great gastronomic interest in Portugal mainland. Eisenia fetida (Savigny, 1826) is a very good source of proteinto be used in animal feed. However, the low content of dry matter (19.03%) and the high content of crude fiber (5.83%) and ash (10.70%), mainly soil, could be a limiting factor to its use as a feed for carnivorous fish. On September, twenty-twojuveniles (0+ years) largemouth bass were caught from a small irrigation dam (N 39º49’27,89’’; W 07º26’57,92’’). Juveniles largemouth basswere stocked in three small tanksfor commercial compound feed training. Because in Portugal there are no specific commercial feed for largemouth bass were used a commercial compound for seabream (Sparus aurata Linnaeus, 1758) and European seabass(Dicentrarchus labrax Linnaeus, 1758)(crude protein 49.74% DM and crude fat 18.07% DM). After 3 weeks 86.4% are well trained. On October 13th, sixteen feed-trained individuals were randomly selected and stocked in two tanks(8 largemouth bassper tankwith 0,048m3of water). In tankG1 (feed E. fetida)and tankG2 (feed commercial compound) largemouth bassweight, length, K condition factor and productivitywere, respectively, 13.62g and 13.40g (p>0.05); 10.49cm and 10.39cm (p>0.05); 1.160 and 1.179 (p>0.05); 2,27kg/m3and 2.23kg/m3). In our experiment, water tankaverage temperature range between 17,1ºC and 24,5ºC and the survival rate was 100%.On day 179 of this study average weight, length, K condition factor and productivityin tankG1 and tankG2 were, respectively, 31.54 g e 40.87 g (p<0.05); 13.01 cm e 14.28 cm (p<0.05); 1.410 e 1.388 (p>0.05); 5.25 kg/m3e 6.80 kg/m3). The results seem to indicate that E. fetidacan be used as feed for largemouth bass.
Abstract: The largemouth bass (Micropterus salmoidesLacépède,1802) is an inland fish species that is of great gastronomic interest in Portugal mainland. Eisenia fetida (Savigny, 1826) is a very good source of proteinto be used in animal feed. However, the low content of dry matter (19.03%) and the high content of crude fiber (5.83%) and ash (10.70%), mainly soil, could be a limiting factor to its use as a feed for carnivorous fish. On September, twenty-twojuveniles (0+ years) largemouth bass were caught from a small irrigation dam (N 39º49’27,89’’; W 07º26’57,92’’). Juveniles largemouth basswere stocked in three small tanksfor commercial compound feed training. Because in Portugal there are no specific commercial feed for largemouth bass were used a commercial compound for seabream (Sparus aurata Linnaeus, 1758) and European seabass(Dicentrarchus labrax Linnaeus, 1758)(crude protein 49.74% DM and crude fat 18.07% DM). After 3 weeks 86.4% are well trained. On October 13th, sixteen feed-trained individuals were randomly selected and stocked in two tanks(8 largemouth bassper tankwith 0,048m3of water). In tankG1 (feed E. fetida)and tankG2 (feed commercial compound) largemouth bassweight, length, K condition factor and productivitywere, respectively, 13.62g and 13.40g (p>0.05); 10.49cm and 10.39cm (p>0.05); 1.160 and 1.179 (p>0.05); 2,27kg/m3and 2.23kg/m3). In our experiment, water tankaverage temperature range between 17,1ºC and 24,5ºC and the survival rate was 100%.On day 179 of this study average weight, length, K condition factor and productivityin tankG1 and tankG2 were, respectively, 31.54 g e 40.87 g (p<0.05); 13.01 cm e 14.28 cm (p<0.05); 1.410 e 1.388 (p>0.05); 5.25 kg/m3e 6.80 kg/m3). The results seem to indicate that E. fetidacan be used as feed for largemouth bass.
Description
Keywords
Alimento granulado Fator K Ganho de peso Índice de conversão Produtividade Feed compound K condition factor Weight gain Feed conversion ratio Productivity
Citation
RODRIGUES, A.M. [et al.] (2023) - Parâmetros de crescimento de achigãs (Micropterus salmoides, Lacépède, 1802) alimentados com Eisenia fetida (Savigny, 1826). Brazilian Journal of Animal and Environmental Research. ISSN 2595-573X.Vol. 6, n.º 3. P. 2316-2330.