Gastrointestinal tract evaluations for oscar and angelfish: anatomic proportions and transit time
Keywords:
anatomy, freshwater fish, nutrition, ornamental fish, Pterophyllum scalare, Astronotus ocellatusAbstract
This study aimed to characterize the anatomy of digestive tract and the gastrointestinal transit time of oscar (Astronotus ocellatus) and angelfish (Pterophyllum scalare), relating the results with the feeding habit. For this purpose, two experiments were conducted. In the first, the stomach somatic index and the intestinal coefficient were evaluated for the two species. In the second experiment, the gastrointestinal transit time was evaluated. The stomach-somatic index averages were higher (P<0.05) for the oscar (0.54 ± 0.14) compared to that for the angelfish (0.19 ± 0.05). On the other hand, the intestinal coefficient was lower (P<0.05) in the oscar (0.46 ± 0.07) than in the angelfish (0.99 ± 0.22). Furthermore, the oscar gastrointestinal transit time (10 h) was faster (P<0.05) in relation to that of the angelfish (12 h). From the results, it is possible to conclude that the oscar digestive tract was more adapted for carnivorous habits, and the angelfish approaches more of a generalist omnivore. Moreover, variations in the size of the digestive system organs could affect the gastrointestinal transit time.
References
Universidade Federal de Santa Maria (UFSM). 352p.
BLAY-JR, J. 2006 Seasonal variation in food preference and feeding ecology of two juvenile
marine fishes, Pseudotolithus senegalensis (Sciaenidae) and Brachydeuterus auritus (Haemulidae) off Cape Coast, Ghana. West Africa Journal of Applied Ecology, 9(1): 1-6.
BOYD, C.E. 2000 Water quality: an introduction.Massachusetts: Klumer Academic Press. 330p.
CHAKRABARTI, I.; GANI, M.A.; CHAKI, K.K.; SUR, R.; MISRA, K.K. 1995 Digestive enzymes in 11
freshwater teleost fish species in relation to food habit and niche segregation. Comparative
Biochemistry and Physiology, 112(1): 167-177.
CHELLAPPA, S. 2005 Acará-bandeira Pterophyllum scalare. In: BALDISSEROTO, B. e GOMES, L.C.
Espécies nativas para piscicultura no Brasil. Santa Maria: Editora da UFSM. p.393-402.
DIAS-KOBERSTEIN, T.C.; CARNEIRO, D.J.; URBINATI, E.C. 2005 Tempo de trí¢nsito gastrointestinal do pacu (Piaractus mesopotamicus) em diferentes temperaturas de cultivo. Acta Scientiarum. Animal Sciences, 27(3):413-417.
FABREGAT, T.E.H.P.; FERNANDES, J.B.K.; RODRIGUES, L.A.; RIBEIRO, F.A.; SAKOMURA, N.K. 2006 Fontes e níveis de proteína bruta em dietas para juvenis de apaiari (Astronotus ocellatus). Acta Scientiarum. Animal Science, 28(4):477-482.
GONí"¡ALVES, L.U. 2013 Morfologia e fisiologia do sistema digestório dos peixes. In: FRACALOSSI,
D.M. e CYRINO, J.E.P. Nutrição e alimentação de espécies de interesse para a aquicultura brasileira.Florianópolis: Aquabio. p.9-36.
KAPOOR, B.G.; SMIT, H.; VERIGHINA, I.A. 1975 The alimentary canal and digestion in teleosts.
Advances in Marine Biology, 13: 109-239.
KENDALL, D. e RAUBENHEIMER, D. 2005 Feeding and Nutrition. In: EVANS, D.H. e CLAIRBONE,
J.B. The Physiology of Fishes. Boca Raton:Taylor & Francis Group, p.47-82.
LANNA, E.A.T.; L.E.; CECON, P.R.; FURUYA,W.M.; BOMFIM, M.A.D. 2004 Digestibilidade aparente e trí¢nsito gastrintestinal em tilápia do Nilo (Oreochromis niloticus), em função da fibra bruta da dieta. Revista Brasileira de Zootecnia,33(6): 2186-2192.
NASCIMENTO, T.M.T.; FABREGAT, T.E.H.P.;RODRIGUES, L.A.; SAKOMURA, N.K.S.; FERNANDES, J.B.K. 2012 Effects of different sampling intervals on apparent protein and energy digestibility of common ingredients by juvenile oscar fish (Astronotus ocellatus). Acta Scientiarum. Animal Science, 34(2): 143-147.
RIBEIRO, F.A.S.; RODRIGUES, L.A.; FERNANDES, J.B.K. 2007 Desempenho de juvenis de acarábandeira (Pterophyllum scalare) com diferentes níveis de proteína bruta na dieta. Boletim do Instituto de Pesca, 33(2): 195-203.
RUST, M.B. 2002 Nutritional Physiology. In:HALVER, J.H. Fish Nutrition. San Diego:Academic Press. p.367-452.
SILVA, J.W. B. 2005 Biologia e cultivo do apaiari Astronotus ocellatus. In: BALDISSEROTO, B. e
GOMES, L.C. Espécies nativas para piscicultura no Brasil. Santa Maria: Editora da UFSM. p.363-387.
SMITH, L.S. 1989 Digestive functions in teleost fishes. In: HALVER, J.H. (ed.) Fish Nutrition.
Academic Press, San Diego: Academic Press.p.333-422.
STOREBAKKEN, T. 1985 Binders in fish feeds I.Effect of alginate and guar gum on growth,
digestibility, feed intake and passage through the gastrointestinal tract of rainbow trout.
Aquaculture, 47(1): 11-26.
ZUANON, J.A.S.; SALARO, A.L.; BALBINO, E.M.; SARAIVA, A.; QUADROS, M.. FONTANARI, R.L. 2006 Níveis de proteína bruta em dietas para alevinos de acará-bandeira. Revista Brasileira de Zootecnia, 35(5): 1893-1896.
