Bacterial infection of mudfish Clarias gariepinus (Siluriformes: Clariidae) fingerlings in tropical nursery ponds

Ikpi, Gabriel; Offem, Benedict

dc.creator	Ikpi, Gabriel
dc.creator	Offem, Benedict
dc.date	2010-01-29
dc.date.accessioned	2016-05-03T15:30:47Z
dc.date.available	2016-05-03T15:30:47Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/3137
dc.identifier	10.15517/rbt.v0i0.3137
dc.identifier.uri	https://hdl.handle.net/10669/26902
dc.description	Bacterial infection among the most common cultured mudfish Clarias gariepinus in Africa, has become a cause of concern, because it constitutes the largest economic loss in fish farms. In order to provide useful biological data of the pathogens for good management practices, samples were collected monthly between January 2008 and December 2009 in three monoculture nursery ponds, located in three different positions: upriver (A, grassland), mid-river (B, mixed forest and grassland) and downriver (C, rainforest) along 200km length of Cross River floodplains, Nigeria. A total of 720 fingerlings between 15.1 and 20.7g were analyzed to determine the degree of infection. The bacterial pathogens were taken from their external surfaces, and were isolated and identified by standard methods. The caudal fins of fingerlings from pond A had the highest bacterial load (5.8x103cfu/g), while the least counts (1.2x103cfu/g) were identified on the head of fish from pond C, with Flexibacter columnaris as the major etiological agent. Pseudomonas fluorescens, Aeromonas hydrophila, Escherichia coli, Staphylococcus aureus and Micrococcus luteus were identified as co-isolates with P. fluorescens as dominant (0.7x102cfu/mL) co-isolates in pond water. Clinical signs of five white spots with red periphery appeared on the external surface of infected fish. All the fish sampled, died after 4 to 9 days. There was no significant difference in the bacterial counts between different ponds, but the difference between fish organs/parts examined was significant. Fish from these ponds are therefore potentially dangerous to consumers and highly devalued, with the economic impact to producers. Preventive methods to avoid these infections are recommended.	es-ES
dc.format	application/pdf
dc.language	spa
dc.publisher	Universidad de Costa Rica	en-US
dc.rights	Copyright (c) 2014 International Journal of Tropical Biology and Conservation	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 59 (2) June 2011	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 59 (2) June 2011	es-ES
dc.source	Revista Biología Tropical; Vol. 59 (2) June 2011	pt-PT
dc.source	2215-2075
dc.source	0034-7744
dc.source	10.15517/rbt.v0i0
dc.title	Bacterial infection of mudfish Clarias gariepinus (Siluriformes: Clariidae) fingerlings in tropical nursery ponds	es-ES
dc.type	artículo original
dc.coverage	CRC	es-ES

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