Lesões anatomopatológicas associadas à ocorrência de bacterioses em tilápias (Oreochromis niloticus) de diferentes sistemas de cultivo em Pernambuco/Brasil

Abstract

The use of methods for identification of agents etiológicos represents an important tool to diagnose illnesses and consequently, to try to minimize the losses caused by the agent's permanence in the fish farmings. In this sense, it was aimed at to associate the lesions anatomopathological with the diversity of bacterias found in collected tilápias of different cultivation systems in Pernambuco. 58 tilápias samples were collected in the summertime period and rainy, that were submitted to analyses anatomopathological and bacteriological, having been observed the occurrence of Aeromonas spp. (29,3%), Vibrio spp. (41,4%) and enterobactérias of the goods Klebsiella spp. (17,2%), Leminorella spp. (1,7%), Obesumbacterium spp. (5,2%), Proteus spp. (1,7%), Providencia spp. (19%), Salmonella spp. (1,7%), Shigella spp. (1,7%) and Taturnella spp. (14%). A significant dependence was detected (p <0,05) of the lesions anatomopathological, with the identified bacterias, as anemic gills, necrosis in the liver and infiltrated eosinofílico in the liver in the animals with Aeromonas spp, lesions in the corporal surface and he/she atrophies in the spleen in the cases with víbrios, lesions in the fins, myocarditis, necrosis in the liver and in the pancreas and infiltrated inflammatory in the liver they were observed in the cases in that enterobactérias of different genders were involved, could be attributed to the unbalance in the atmosphere, contributing in the susceptibilidade of the animals front to these agents opportunists, also existing the possibility of they be associated to the concomitant presence of Aeromonas spp, once there was a significant correlation (p <0,05) in the enterobactérias occurrence and Aeromonas spp. It was verified, through mathematical modelling, that the coming animals of cultivation farms in tank-net, as well as the ones that possess larger corporal total lengths, they presented a better weight earnings.