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Aquaculture breeding and genetics
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Do you want to produce salmon with extra red fillet, which is sought-after on the Japanese market, or salmon with a particularly high resistance to disease in exposed areas?
Nofima Marin has studied the conditions under which it can be worthwhile for fish farmers to buy roe with selectively bred traits.
Tailor-made
Utilising roe selectively bred for specific markets involves using a few parents with known...
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A researcher at Ohio State University says he is working on producing larger bluegill by breeding super males with two Y chromosomes.
The male bluegill are about twice as big as females and thus more profitable for fish farmers, The Columbus Dispatch reported Sunday.
Han-Pin Wang, a researcher in the Ohio State aquaculture lab, uses a method based on the genetic difference between males and females. Like humans, male bluegill normally have an XY chromosome pair...
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New genetic technologies are being developed by Norwegian and Indian scientists to give tiger shrimp and rohu carp improved resistance against disease.
Tiger shrimp plays a significant role in the aquaculture exports of India while rohu carp is a widely cultivated and a relatively inexpensive protein source for rural India. However, disease caused by White spot syndrome virus and Aeromonas are a major problem limiting aquaculture production of the two species in...
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Shrimps as we know it are a favourite dish for many, whether it is deep fried, mixed with fresh vegetables, dipped in coconut milk or simply boiled. In the various communities in Fiji shrimps are cooked in many ways, style and flavour that is sure to bring heaven to your doorsteps. Our story today focuses on a new shrimp species brought all the way from Malaysia (Ura susu) which has been in hibernation under the watchful eyes of the USP Maritime team of students and its...
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They may not be beauty queens, but channel catfish are worth a pretty penny. In fact, farm-level sales of catfish brought in over $400 million in 2008, making them the most popular farmed fish in the United States.
To support this important industry, scientists with the Agricultural Research Service (ARS) are investigating how breeding programs and management practices can promote catfish health. ARS is the principal intramural scientific research agency of the U.S. Department...
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Has the fish on you dinner table gone through a drug induced sex change? If the fish is tilapia, the answer is probably yes. Tilapia is a delicious, mild flavored fish that has become very popular because of its low price. This low price is achieved by converting the young females to males through the use of the hormone drug 17alpha-methytestosterone. Raising an all male population allows fish farmers to produce bigger fish in a shorter time period with less feed. It also allows them to...
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Visiting UOG Professors Jian-Hua Xiong and Yong-Zhen Zhao are working on a mating model for shrimp, selecting males and females from different families in order to produce a line of super shrimp.
Dr. Xiong is a molecular biologist who works on identifying shrimp genotypes from different families and looking at their genetic relationships. His experiments involve extracting DNA from shrimp then using electrophoresis systems to find their...
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In six months, researchers hope to give India's marine aquaculture export a leg-up by developing a technology to breed the Cobia (Rachycentron canadum), a brackish water fish, in marine cages on offshore sites. When it happens, it will be a first in India. Animal husbandry, dairying and fisheries department secretary C Muthukumaraswamy says, "India can use this opportunity to standardise the breeding protocol to produce Cobia seeds and farming methods." Experts in the...
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Government will be banking on a new variety of Tilapia to help secure local food sources.
Agriculture Secretary Arthur Yap said the Bureau of Fisheries and Aquatic Resources (BFAR) will be holding mass distribution of Tilapia fingerlings that will survive on saline or brackish water.
The new strain was developed by BFAR's facilities in Dagupan City and Science City of Muñoz, Nueva Ecija.
As the 8th largest fish producing country, the...
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A team of researchers from the Institute of Aquaculture at the University of Santiago (USC) are working on carrying out genetic and sanitary improvements in turbot ( Psetta maxima ) aimed at curbing high mortality of the fish in Galician marine farms.
Funded by the Xunta de Galicia, the initiative is coordinated by the Genetics Group for Aquaculture at the College of Veterinary Medicine of Lugo and the Department of Microbiology at the University of...
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New research shows that environmental pollutants in Store Lungegårdsvann in Bergen affect gene expression involved in detoxification mechanisms and hormone balance in Atlantic cod. The research is part of the National Institute of Nutrition and Seafood Research' (NIFES) work to identify effects of environmental pollutants on fish health and seafood safety.
NIFES has studied the expression of genes in cod from the Store Lungegårdsvann, a seawater recipient...
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Plastic irrigation tubing ( gut pipe or poly pipe) is often used as a spawning substrate by fathead minnow producers because used pipe is available for free. However, recent research (Masson et al. 2006) has confirmed that fathead minnow eggs do not stick well to smooth surfaces. While rough or textured surfaces retained 72 to 77 % of eggs, only 41% of eggs stuck to poly pipe. Eggs that do not stick in the nest are not likely to survive. Benoit and Carlson (1977) first found that...
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New detailed maps of rainbow trout genes and how they relate to key traits like disease resistance, stress response, and growth are being produced by Agricultural Research Service (ARS) scientists and their counterparts in France.
By combining information from genetic maps and physical maps, a more complete picture of the trout genome is created, enabling scientists to pinpoint genes that affect key aquaculture production traits in rainbow trout.
Rainbow trout is one of the...
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A researcher has studied hours of prawn "sex tapes" to find out why prawns bred in captivity did not go on to breed well.
Life sciences researcher Gay Marsden, from Queensland University of Technology, spent two months filming what prawns got up to when the sun went down.
"The Australian prawn aquaculture industry depends on black tiger prawns, Penaeus monodon," Ms Marsden said.
"Currently the broodstock that supply the larvae to stock the ponds...
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Clean Seas has announced that its Southern Bluefin Tuna broodstock have commenced spawning and it is anticipated that this Summer's larval rearing trials will soon commence at its Arno Bay hatchery on South Australia's Eyre Peninsula.
The spawning coincides with this week's visit to Arno Bay of a high-level scientific delegation from Kinki University in Japan, comprising Professor Dr. Murata, Professor Dr Takii, Assistant Professor Dr Nakagawan and Dr Kato. ...
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A P.E.I. aquaculture company is a step closer to getting its genetically modified salmon on the market.
Aqua Bounty Farms in Fortune, in eastern P.E.I., has been waiting more than a decade for federal approval in the United States. If the company gets the nod from the Food and Drug Administration, its salmon will be the world's first on the market.
FDA officials...
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A new species of fish from tropical South America is confirming suspected roots to the loricariid catfish family tree. Lithogenes wahari shares traits with two different families of fish: the bony armor that protects its head and tail, and a grasping pelvic fin that allows it to climb vertical surfaces. The discovery of both of these characteristics in Lithogenes suggests to ichthyologists Scott Schaefer of the American Museum of Natural History and Francisco Provenzano of the Universidad...
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The Columbia Inter-Tribal Fish Commission is testing technology to hasten the identity the makeup of salmon populations to determine the mix in any sample of fish, a potentially valuable tool for managing threatened or endangered stocks. "The process started out a couple of decades ago when we were able to process tens of samples at a time. The new technology will give fish scientists the capacity to process 9,000 genetic markers in a four-hour period," said Phil Roger,...
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Female promiscuity appears to have triggered changes in the type of sperm a male produces, according to new research on fish from central Africa.
The study, published in the Proceedings of the National Academy of Sciences of the USA, examines how competition for reproduction influences the sperm of many species of African cichlids. These fish have extremely diverse mating behaviours, ranging from strict monogamy to species where females mate with many males in quick...
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Female promiscuity appears to have triggered changes in the type of sperm a male produces, according to new research on fish from central Africa.
The study, published in the Proceedings of the National Academy of Sciences of the USA, examines how competition for reproduction influences the sperm of many species of African cichlids. These fish have extremely diverse mating behaviours, ranging from strict monogamy to species where females mate with many males in quick...
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New research strengthens the link between water pollution and rising male fertility problems. The study, by Brunel University, the Universities of Exeter and Reading and the Centre for Ecology & Hydrology, shows for the first time how a group of testosterone-blocking chemicals is finding its way into UK rivers, affecting wildlife and potentially humans. The research was supported by the Natural Environment Research Council and is now published in the journal Environmental Health...
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