Data/hora: 06/06/2024 11:55:03

Provedor de dados: | 27
País: | Belgium
Título: | Vibrios associated with &lt;i&gt;Penaeus chinensis&lt;/i&gt; (Crustacea: Decapoda) larvae in Chinese shrimp hatcheries
Autores: | Vandenberghe, J.; Li, Y.; Verdonck, L.; Li, J.; Sorgeloos, P.; Xu, H.S.; Swings, J.
Data: | 1998
Ano: | 1998
Palavras-chave: | Penaeus chinensis (Osbeck).
Resumo: | Bacteriological surveys were performed in 1995 and 1996 in three shrimp hatcheries located in the north of the People’s Republic of China. Samples were taken from routine productions of healthy &lt;i&gt;Penaeus chinensis&lt;/i&gt; larvae, their environment and from diseased larvae. A total of 186 isolates from the dominant bacterial flora was characterized by Biolog metabolic fingerprinting and identified by comparison to a database of 850 Vibrio type- and reference strains. Representative &lt;i&gt;Vibrio harveyi&lt;/i&gt; strains were further genotypically analyzed by AFLP fingerprinting of whole-genomes. An overwhelming predominance of &lt;i&gt;V. alginolyticus&lt;/i&gt; and &lt;i&gt;V. harveyi&lt;/i&gt; was observed in the larval developmental stages from zoae stage on. The flora associated with larvae is not very stable and is influenced by the bacterial flora of the administered food and by the environment. In the 1995 survey, the bacterial flora of successful &lt;i&gt;P. chinensis&lt;/i&gt; larvae productions was mainly dominated by &lt;i&gt;V. alginolyticus&lt;/i&gt; and unidentified Gram negative strains, while &lt;i&gt;V. harveyi&lt;/i&gt; was absent. The bacterial numbers gradually increased from nauplii stage to post-larval stage, but few vibrios were isolated from nauplii stage. High &lt;i&gt;V. harveyi&lt;/i&gt; numbers (up to 10&lt;sup&gt;5&lt;/sup&gt; CFU/larva) in the larvae are correlated with weak larvae and mass mortalities. Between &lt;i&gt;V. harveyi&lt;/i&gt; strains, isolated from healthy and diseased larvae, no phenotypic or genotypic differences were found. The presence of &lt;i&gt;V. alginolyticus&lt;/i&gt; might influence the pathogenicity of &lt;i&gt;V. harveyi&lt;/i&gt; or might have an impact on the resistance of larvae to bacterial pathogens.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.vliz.be/nl/open-marien-archief?module=ref&refid=322
Fonte: | %3Ci%3EAquaculture+169%3C%2Fi%3E%3A+121-132
Fonte: | info:eu-repo/semantics/restrictedAccess