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Bacterial Populations during Rainbow Trout Egg Culture in Vertical‐Flow Tray Incubators
Author(s) -
Barnes Michael E.,
Gabel Audrey C.,
Cordes Rick J.
Publication year - 2000
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/1548-8454(2000)062<0048:bpdrte>2.0.co;2
Subject(s) - biology , rainbow trout , tray , zoology , fishery , fish <actinopterygii> , botany
Bacterial samples were collected from water flowing through vertically stacked trays during incubation of eggs of rainbow trout Oncorhynchus mykiss. An initial peak in bacteria numbers occurred at the eyed egg stage with a subsequent decline after mechanical picking of dead eggs. A second peak, greater in magnitude and duration than the first, began at hatching and lasted for approximately 10 d before decreasing. A final peak was observed just before fry removal from the incubators at swim‐up. Throughout incubation, bacterial abundance increased from top to bottom of each incubator stack. Mechanical picking of dead eggs at the eyed stage led to decreased bacteria numbers. Egg survival at the eyed stage and survival to fry swim‐up were not influenced by tray position.