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

Yellow perch. (Photo Credit: USDA)

New method distinguishes yellow perch sex

Click on the flag for more information about United States UNITED STATES
Tuesday, June 03, 2014, 04:00 (GMT + 9)

Identifying juvenile and adult yellow perch females from males is no longer an obstacle for aquaculture producers of this high-value fish, thanks to US Department of Agriculture (USDA) scientists. A new step-by-step procedure developed by the scientists makes it easier to separate fish by gender for growth performance, physiological studies and to manage broodstocks for reproduction and genetic selection.

Physiologist Brian Shepherd and his colleagues at the Agricultural Research Service (ARS) Dairy Forage and Aquaculture Research Unit in Milwaukee, Wisconsin, developed the systematic method to segregate yellow perch females from males during early growth stages. Because females tend to grow faster and larger than males, females could often be mistaken for males when being selected for genetic improvement prior to reproductive maturity. Previously, it was extremely difficult to identify gender until fish matured (up to two years).

The method involves an algorithm—a checklist that includes the size of the fish and the shape and colour of the anal and reproductive openings. The process is fast, easy, reliable and more than 97 per cent accurate in fish above three inches in length.

Factors such as size and geographical origin can affect external characteristics related to yellow perch gender. Therefore, scientists examined yellow perch strains from four different geographical areas, while considering body size and reproductive maturity. They then identified female and male characteristics that could be confirmed in yellow perch of various sizes from the four geographical strains.

The new system allows producers as well as scientists to identify the largest females and males for producing the next generation of yellow perch. Because fish are unharmed during the process, the method also can be used to identify females from males when wild yellow perch field surveys are taken.



Click to know how to advertise in FIS
Nov 25, 03:10 (GMT + 9):
Industrial sector seeks to make clarify fishing operations
Nov 25, 02:30 (GMT + 9):
Nestle admits slave labour in its Thai supply chain
Viet Nam
Nov 25, 02:00 (GMT + 9):
Shrimp exports experience sharp drop
Nov 25, 01:10 (GMT + 9):
Aquaculture exports fall 'due to external factors'
Nov 25, 01:00 (GMT + 9):
IN BRIEF - Thai Union expects decision on Bumble Bee acquisition on Dec. 18 2015
European Union
Nov 25, 01:00 (GMT + 9):
IN BRIEF - Rabobank and the EIB encourage SMEs and midcaps
Nov 25, 01:00 (GMT + 9):
IN BRIEF - Woolworths Launches First Private Label ASC Certified Fish in South Africa
Nov 25, 01:00 (GMT + 9):
IN BRIEF - Marel agrees to acquire MPS meat processing systems- favorable long-term financing secured
Nov 25, 01:00 (GMT + 9):
IN BRIEF - Marystown aquaculture project faces environmental delay
Republic of Ireland
Nov 25, 01:00 (GMT + 9):
IN BRIEF - Demand to ban super-trawlers in Irish waters as big boats feast on fish while local vessels lie idle
United States
Nov 25, 01:00 (GMT + 9):
IN BRIEF - Seattle's aging fishing fleets provide USD 100 million opportunity for shipbuilders
Nov 25, 00:10 (GMT + 9):
ASC launches audit manual for seriola and cobia standard
Nov 24, 23:50 (GMT + 9):
Anchovy catches to grow 90pc in 2015
Nov 24, 23:30 (GMT + 9):
Challenging market conditions, competition affect Haikui Seafood's results
Nov 24, 22:30 (GMT + 9):
Peru becomes an active member of SPRFMO

Nanotechnology becomes new technological tool to develop seafood
Spain Anfaco-Cecopesca, through its Technology Centre, is developing an ambitious R+D+i project aimed at the enhancement of marine resources for the production of bioactive compounds and the design of functional foods, applying nanotechnology as essential facilitating technology.
Anchovy fishing could grow 73pc this year
Peru The Ministry of Production is planning that this year anchovy fishing grows by 73 per cent compared to 2014, if it is possible to complete the quota set for the second fishing season.
Spanish vessels may fish in Mauritania 'before Christmas'
Spain The Secretary General of Fisheries confirmed that the Spanish fleet can resume fishing activities in Mauritanian waters before Christmas, following the entry into force of the fisheries agreement between the EU and Mauritania.
Scientists reveal ocean fish camouflage secrets
United States A team of scientists from the University of Texas, Austin, has found out that certain fish use microscopic structures called platelets in their skin cells to reflect polarized light, which allows the fish to seemingly disappear from their predators.
Maruha Nichiro Corporation
Nichirei Corporation -Headquarter-
Pesquera El Golfo S.A.
Ventisqueros - Productos del Mar Ventisqueros S.A
Wärtsilä Corporation -Wartsila Group Headquarter-
ITOCHU Corporation -Headquarter-
BAADER - Nordischer Maschinenbau Rud. Baader GmbH+Co.KG (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Nueva Pescanova, S.L. - Group Headquarters
Sea Harvest Corporation (PTY) Ltd.
I&J - Irvin & Johnson Holding Company (Pty) Ltd.
Blue Continent Products (Pty) Ltd - (Oceana Group Limited)
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. -Headquarter-
Starkist Seafood Co. - Headquearters
Trident Seafoods Corp.
American Seafoods Group LLC - Head Office
Marel ehf - 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.
Food Project (Siam) Co., 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)
Omega Protein Corporation -Headquarter-
Marona S.A.
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. -Headquarter-
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
Mitsubishi Corporation Marine Products Depts. D.Team
CJ Corporation  -Holding Headquarter-
Greenpeace International - The Netherlands
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
Ocean Trawlers Group - Ocean Trawlers HK Ltd.
Natori Co., Ltd.
Carrefour Supermarket - Headquarters
FedEx Corporation -Headquarter-
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
INVE Group - Head Office
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
Morpol ASA - Group Headquarters
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2015 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER