Water quality and microbial community structure in juvenile Atlantic cod (Gadus morhua L.) cultures

Abstract

Havforskningsinstituttets institusjonelle arkiv Brage IMR - Institutional repository of the Institute of Marine Research b r a g e i m rDette er forfatters siste versjon av den fagfellevurderte artikkelen, vanligvis omtalt som postprint. I Brage IMR er denne artikkelen ikke publisert med forlagets layout fordi forlaget ikke tillater dette. Du finner lenke til forlagets versjon i Brage-posten. Det anbefales at referanser til artikkelen hentes fra forlagets side. Ved lenking til artikkelen skal det lenkes til post i Brage IMR, ikke direkte til pdf-fil.This is the author's last version of the article after peer review and is not the publisher's version, usually referred to as postprint. You will find a link to the publisher's version in Brage IMR. It is recommended that you obtain the references from the publisher's site.Linking to the article should be to the Brage-record, not This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractThe effect of water treatment and flow rate on young Atlantic cod juveniles was investigated in a 36-days experiment. Four different flow rates (10, 20, 40, and 70 times the effective tank volume per day) were set up in triplicate tanks within each of three rigs with recirculated, UV-radiated, and untreated water, respectively. Each of the 36 tanks was stocked with 200 weaned cod juveniles at a mean weight of 0.048g. Fish mortality was recorded daily in all tanks, and growth (wet weight) was determined at the end of the experiment. The microflora in the rearing water was investigated by means of PCR-DGGE and flow cytometry. Observed mortality was significantly higher at low flow rates while otherwise unexplained mortality (presumed to be due to cannibalism) was lowest in the recirculation system. No correlation was found between survival and growth. Growth was significantly affected by both water exchange rate and treatment, as the juveniles from high flow rates and the UV-treatment showed elevated growth rates. Both growth and survival scaled in accordance with metabolic Runar Thyrhaug passed away January 7, 2011. The authors wish to dedicate this paper to his memory. * Corresponding author. Tel.: +47 56182262; fax: +47 56182222. E-mail address: Terje.van.der.Meeren@imr.no Deceased A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 factors like oxygen saturation and unionized ammonia. Bacterial concentrations increased in all tanks and treatment from the beginning of the experiment to the end. The UV-treated and untreated water started at typical seawater concentrations (0.5-1 x10 6 mL -1 ) and increased five t...

16S rRNA-Based metagenomic analysis of microbial communities associated with wild Labroides dimidiatus from Karah Island, Terengganu, Malaysia

“…This has been reported prevalent in many other marine environments [ [34] , [35] , [36] ]. Alteromonas has also been reported in some species of fish reared in a re-circulatory aquaculture system [ 37 , 38 ]. The bacteria group Alteromonas have great carbon cycling potential, hence are composite of member of the marine master recyclers [ 39 , 40 ].…”

Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhuaL.) larvae — can we identify the underlying factors?

“…Larvae in three of the tanks (randomized) were fed copepods, while in the other three tanks they were first-fed enriched rotifers followed by enriched Artemia . Water flow was increased with age, from 1 L min −1 initially to 6 L⋅ min −1 at weaning, and further to 10 L min −1 at experiment termination, giving a water exchange rate of 32 tank volumes day −1 ( van der Meeren et al, 2011 ). The temperature was gradually increased from 8 °C at transfer to 11.6 °C at 11 dph ( Fig.…”

Identification of Bacterial Community Composition in Freshwater Aquaculture System Farming of Litopenaeus vannamei Reveals Distinct Temperature-Driven Patterns

“…Using the DGGE technique, bacterial community structures have been investigated in various aquaculture settings in different parts of the world, e.g., culturing the tropical rock lobster ( Panulirus ornatus ) in Australia [ 13 ], the Pacific white shrimp ( L . vannamei ) in the USA [ 14 ], the Asian tiger shrimp ( Litopenaeus monodon ) in Thailand [ 15 ], the Atlantic cod ( Gadus morhua L.) in Norway [ 16 ], the grass carp ( Ctenopharyngodon idellus ) in Zhangjiang, China [ 17 ], as well as the shrimp ( Penaeus vannamei , Penacus orientalis ), abalone ( Haliotis diversicolor ) and reef cod ( Epinephelus diacanthus ) in coastal mariculture ponds in Southeast China [ 18 ]. These studies have proposed strong links between environmental variables (e.g., season, water flow rate and aeration) and bacterial population structures in the aquaculture niches.…”