Welcome to FIS   Sponsored By
United States
Subscribe to FIS | Register with FIS | Advertise with FIS | Newsletter | About FIS | Contact us
   


Standard (left) and enriched (right) rearing tanks (Photo: Pekka Hyvärinen / Luke)

Enriched environment enhances survival of farmed fish from bacterial disease

Click on the flag for more information about Finland FINLAND
Monday, August 19, 2019, 00:00 (GMT + 9)

Cooperative study conducted by University of Jyväskylä and Natural Resources Institute Finland (Luke), revealed that enriched rearing of juvenile fish significantly enhances the survival of fish from bacterial infection commonly seen in rearing conditions. That may also improve the post release survival of the fish after stocking into the wild.

The study has been published in Journal of Applied Ecology.

Importance of aquaculture is increasing worldwide. Along with food production, rearing of endangered fish populations for supportive stocking has become important. In such actions, it is important that the behavior and survival of introduced fish resembles to that of their natural conspecifics.

Traditional stimulus poor rearing environment offers favorable conditions for spread of parasites and diseases, which can significantly reduce the pre- and post-release survival of aquaculture fish. For enhancing the quality of stocked fish, enriched rearing method has been developed in Kainuu Fisheries Research Station of Luke in Paltamo. In this method, structures are added to rearing tanks to increase habitat complexity and resemblance to natural conditions. Earlier, enriched rearing has also been shown to enhance survival of fish during disease epidemics in rearing conditions, but the underlying mechanisms have remained unclear.

Standard (left) and enriched (right) rearing tanks during (a) start feeding stage of the fish (approx. 1 month old), (b) in juvenile stage (one summer old) and (c) in smolt stage (1 year old) used in the two experiments. Enrichment included introduction of gravel and shelters into the smaller 3Á2-m 2 tanks (a & b) or shelters and stones in the larger 50-m 2 tanks (c). In addition, irregular changes of water inflow, volume and direction were applied in the enriched tanks. (Photo: luke.fi/researchgate.net)

New results about the effects of enriched rearing have now been achieved from collaborate study of University of Jyväskylä and Luke. The study showed that enriched rearing enhanced the survival of Atlantic salmon (Salmo salar) and sea migrating brown trout (Salmo trutta) exposed to a common pathogenic fish bacterium, the Flavobacterium.

"Adding enrichments to rearing tanks significantly improved the survival of fish during natural disease outburst. However, there were minor differences between fish species and populations", says PhD student Ville Räihä from University of Jyväskylä.

Survival curves of one-summer-old Atlantic salmon of different rearing (standard, enriched) and parent (hatchery, wild) backgrounds during Ichthyobodo necator outbreak in indoor tanks in Experiment 1 in 2009. Each curve represents an average from four replicate tanks. Infection was treated with formalin on day 25.(Photo: luke.fi/researchgate.net)

Benefits of enriched tank can be seen quickly

The beneficial effects of enrichments can be seen very quickly in just few days. One proposed reason may be e.g. the better stress tolerance levels of fish in enriched environment, but this has not been studied yet, Ville Räihä evaluates.

For experimental infection, fish were raised in enriched or standard conditions for six months, after which they were exposed to Flavobacterium in both of these environments.

Survival curves of 1-year-old Atlantic salmon of different rearing (standard, enriched) and parent (hatchery, wild) backgrounds during (a) Ichthyophthirius multifiliis and (b) Flavobacterium columnare outbreaks in outdoor tanks in Experiment 1 in 2010. Each curve represents an average from two replicate tanks. Infections were treated with formalin (I. multifiliis, 7 treatments between days 29 and 50) or antibiotics (F. columnare, course between days 11 and 20).(Photo: luke.fi/researchgate.net)

"The controlled exposure revealed that fish exposed to the disease in enriched environment had higher survival regardless of the rearing background in standard or enriched conditions. This emphasizes the importance of the environment of exposure for severity of the disease", Ville Räihä tells.

The results of the study may advance e.g. the development of natural disease prevention methods in aquaculture.

The study was conducted at Kainuu Fisheries Research Station of Luke in Paltamo in 2017. The study was supported by the Academy of Finland, the Finnish Centre of Excellence Program of the Academy of Finland, the CoE in Biological Interactions 2012-2017, the Jane and Aatos Erkko Foundation, European Maritime and Fisheries Fund, and the Doctoral School of University of Jyväskylä.

Source: University of Jyväskylä


[email protected]
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
Mexico
Sep 20, 18:30 (GMT + 9):
Fishing ban on smal pelagics begins in the Gulf of California
Spain
Sep 20, 18:10 (GMT + 9):
Sealab project plans to present prototype portable laboratory for water quality analysis in 2020
India
Sep 20, 07:00 (GMT + 9):
Seafood exports expected to reach USD 14 billion over the next five years
Spain
Sep 20, 06:00 (GMT + 9):
The fishing sector is sailing towards the future: rigid sails, ‘blockchain’ for fresh fish and online auctions
United Arab Emirates
Sep 20, 00:10 (GMT + 9):
Emirates SkyCargo parterns with start-up for greater transparency in seafood supply chain
Spain
Sep 19, 22:50 (GMT + 9):
Frinsa buys 50% of the Portuguese cannery A Poveira
Thailand
Sep 19, 22:20 (GMT + 9):
Spectre of abuse and illegal fishing looms again due to industry lobby
United States
Sep 19, 21:40 (GMT + 9):
New study estimates vulnerability of Eastern Bering Sea stocks to climate change
European Union
Sep 19, 20:00 (GMT + 9):
Italian MEP asks for information regarding agreement between Federpesca Mazara and the Libyan Military
Japan
Sep 19, 18:30 (GMT + 9):
Surimi soaring, kneaded paste processor increases price and resizes
Thailand
Sep 19, 16:50 (GMT + 9):
Important growth in shrimp exports to China
Peru
Sep 19, 06:40 (GMT + 9):
Non-traditional fishery exports grew 5% in January-July
Viet Nam
Sep 19, 06:00 (GMT + 9):
Shrimp exports expected to improve in H2
Spain
Sep 19, 05:30 (GMT + 9):
Andalusia expands aid for biological stoppage of trawl fleet in the Gulf of Cádiz
Chile
Sep 19, 05:20 (GMT + 9):
SERNAPESCA rules out recalculation of escaped salmon from MOWI farming center



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Jack mackerel exports register exponential growth
Peru Jack mackerel exports recorded an exponential growth in the first half of the year, reaching USD 37.4 million, an increase of 2156% over the same period of 2018 (USD 1.6 million), reports the Associat...
Fisheries bill falls after Parliament's suspension
United Kingdom Boris Johnson's suspension of Parliament means 13 high-profile government bills have been lost, including a law protecting victims of domestic abuse and key pieces of post-Brexit legislation. When ...
More than 20 illegal tons of hake sezed in nine Peruvian regions
Peru The General Directorate of Supervision, Supervision and Sanction of the Ministry of Production (PRODUCE) reportes that between January and September 2019 it has carried out 3114 inspections, seizing m...
More than 3,500 sales points join the fresh Norwegian 'fogonero' (Saithe - Pollachius virens) campaign
Spain Last year 700 tons of this white fish were sold in Spain with quality assurance of Norwegian Sea products The fresh Norwegian saithe is a very versatile, healthy, tasty option and at a ...
 
Maruha Nichiro Corporation
Nichirei Corporation - Headquarters
Pesquera El Golfo S.A.
Ventisqueros - Productos del Mar Ventisqueros S.A
Wärtsilä Corporation - Wartsila Group Headquarters
ITOCHU Corporation -Headquarter-
BAADER - Nordischer Maschinenbau Rud. Baader GmbH+Co.KG (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Sea Harvest Corporation (PTY) Ltd. - Group Headquarters
I&J - Irvin & Johnson Holding Company (Pty) Ltd.
AquaChile S.A. - Group Headquarters
Pesquera San Jose S.A.
Nutreco N.V. - Head Office
CNFC China National Fisheries Corporation - Group Headquarters
W. van der Zwan & Zn. B.V.
SMMI - Sunderland Marine Mutual Insurance Co., Ltd. - Headquarters
Icicle Seafoods, Inc
Starkist Seafood Co. - Headquearters
Trident Seafoods Corp.
American Seafoods Group LLC - Head Office
Marel - Group Headquarters
SalMar ASA - Group Headquarters
Sajo Industries Co., Ltd
Hansung Enterprise Co.,Ltd.
BIM - Irish Sea Fisheries Board (An Bord Iascaigh Mhara)
CEFAS - Centre for Environment, Fisheries & Aquaculture Science
COPEINCA ASA - Corporacion Pesquera Inca S.A.C.
Chun Cheng Fishery Enterprise Pte Ltd.
VASEP - Vietnam Association of Seafood Exporters & Producers
Gomes da Costa
Furuno Electric Co., Ltd. (Headquarters)
NISSUI - Nippon Suisan Kaisha, Ltd. - Group Headquarters
FAO - Food and Agriculture Organization - Fisheries and Aquaculture Department (Headquarter)
Hagoromo Foods Co., Ltd.
Koden Electronics Co., Ltd. (Headquarters)
A.P. Møller - Maersk A/S - Headquarters
BVQI - Bureau Veritas Quality International (Head Office)
UPS - United Parcel Service, Inc. - Headquarters
Hamburg Süd Group - (Headquearters)
Armadora Pereira S.A. - Group Headquarters
NOAA - National Oceanic and Atmospheric Administration (Headquarters)
Mowi ASA (formerly Marine Harvest ASA) - Headquarters
Marubeni Europe Plc -UK-
Findus Ltd
Icom Inc. (Headquarter)
WWF Centroamerica
Oceana Group Limited
The David and Lucile Packard Foundation
Ajinomoto Co., Inc. - Headquarters
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
CJ Corporation  - Group Headquarters
Greenpeace International - The Netherlands | Headquarters
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
NOREBO Group (former Ocean Trawlers Group)
Natori Co., Ltd.
Carrefour Supermarket - Headquarters
FedEx Corporation - Headquarters
Cooke Inc. - Group Headquarters
AKBM - Aker BioMarine ASA
Seafood Choices Alliance -Headquarter-
Austevoll Seafood ASA
Walmart / Wal-Mart Stores, Inc. (Supermarket) -Headquarter-
New Japan Radio Co.Ltd (JRC) -Head Office-
Gulfstream JSC
Marine Stewardship Council - MSC Worldwide Headquarters
Royal Dutch Shell plc (Headquarter)
Genki Sushi Co.,Ltd -Headquarter-
Iceland Pelagic ehf
AXA Assistance Argentina S.A.
Caterpillar Inc. - Headquarters
Tiger Brands Limited
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2019 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER