The pathogenicity of a Streptococcus ictaluri isolate in channel catfish Ictalurus punctatus at the fry (0.5 g), fingerling (15 g), and juvenile (55 g) stages was determined by experimental bath immersion and injection experiments. Channel catfish were exposed in 1-L immersion baths containing 10(8), 10(9), 10(10), 10(11) or 10(12) colony-forming units (cfu) of S. ictaluri. Fish were also injec...

Explanations for positive and negative genetic correlations between growth and fitness traits are essential for life-history theory and selective breeding. Here, we test whether growth and survival display genetic trade-off. Furthermore, we assess the potential of third-party traits to explain observed genetic associations. First, we estimated genetic correlations of growth and survival of rain...

Address correspondence to: Luís André Sampaio. Fundaçao Universidade Federal do Rio Grande, Departamento de Oceanografia, Laboratório de Maricultura, Caixa Postal 474, CEP 96201-900, Rio Grande, RS, BRASIL. Fax: (+55-53) 3236-8042. E-mail: [email protected] Received on December 27, 2004. Accepted on June 1, 2005. The marine “pejerrey” Odontesthes argentinensis is a valuable marine fish reso...

Aim of study: To evaluate the effects increasing NaCl levels on zootechnical performance pacu fingerling. Area The experiments were conducted at Aquatic Organism Production and Reproduction Systems Laboratory belonging to Federal University Paraná (UFPR), in Palotina Sector, Estate, Brazil. Material methods: Seven hundred fifty fingerlings with an average weight 3.41 ± 0.09 g distributed circul...

Flavobacterium columnare is an important pathogen of freshwater fish, implicated in skin and gill disease, often causing high mortality. An outbreak of skin disease in fingerling and adult Nile tilapia, Oreochromis niloticus (L.), cultivated in a recirculation system, was investigated. Four strains were isolated and characterized by biochemical reactions, enzyme production, fatty acid profile a...