Premium
Isolation and characterization of bacteria causing mortality in early stage larvae of captive‐bred Japanese eels ( A nguilla japonica Temminck & Schlegel)
Author(s) -
Nakase Gentoku,
Tokuda Masaharu,
Nomura Kazuharu,
Tanaka Hideki
Publication year - 2015
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12418
Subject(s) - biology , larva , hatching , japonica , japanese eel , bacteria , zoology , isolation (microbiology) , aquaculture , 16s ribosomal rna , microbiology and biotechnology , fishery , ecology , fish <actinopterygii> , botany , genetics
Bacteria with lethal effect on eel larvae were isolated from moribund captive‐bred eel larvae and their 16S rRNA gene sequences were analysed. Nucleotide sequence of 10 isolates showed highest similarity with L acinutrix algicola , C rocinitomix catalasitica and P seudoalteromonas rubra . Age‐dependent changes in the susceptibility of eel larvae were observed in response to challenge by a highly lethal isolate. Compared with 10 and 11 days after hatching (DAH), larval susceptibility to the highly lethal isolate was lower at 18 DAH. We found that the bacterial isolates have lethal effect on the captive‐bred eel larvae, especially at the early developmental stage. These results will be useful to establish appropriate culture practices for eel larvae that will improve the success of mass production of glass eels for aquaculture.