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Aquaculture breeding and genetics
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Introduction Hematological parameters of fish blood are useful tools that aid in the study immuno-potentiators. Such tests are general but not conclusive and must be correlated with biochemical tests of the subject. The classification of leucocytes as in the vertebrates has been done following morphological criteria where by various groups can be distinguished such as lymphocytes, granulocytes and macrophages (Ellis, 1981). Dominguez et al. (2004) confirmed that elevating...
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Introduction Penzlin (1977) cited that blood constituents of fish are variable than those of the terrestrial animals. Abdelhamid (1991) argumenta for the variation between fish and terrestrial animals to the huge number of fish species (ca. 25.000) and strains (40.000) in comparison with the mammalian species (ca. 4.500). Additionally, Abdelhamid (2009) cited that fish are variable in their morphology, biology, anatomy, physiology, reproduction,...
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1. Introduction Teleosts fish species are one of the largest sources of protein for humans through their extensive production in aquaculture. There has been a growing trend in the last decades into the use of genomics to improve our disease control and prevention strategies against various diseases infecting different fish species in aquaculture. As such, genomics studies in aquaculture have evolved from reductionist single gene sequencing to high throughput next (HTS)...
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Introduction Carp is one of a few species of freshwater fish that can be considered as domesticated, but there is a considerable difference between the domesticated population and its wild relation with respect to reproduction capacity, growth, utilization of feeds, etc. The wild population is covered with scales and grows slowly while, the domesticated populations of both scaly and mirror varieties utilize artificially fed cereals and natural food well, giving rapid growth....
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Introduction The spider crabs of the genus Maja Lamarck, 1801 (Majoidea: Majidae), with around 20 described species worldwide, are represented on European coasts by four species: M. brachydactyla (Balss, 1922), M. crispata (Risso, 1827), M. goltziana (D’Oliveira, 1888) and M. squinado (Herbst, 1788) (Neumann 1998, Ng et al. 2008, Sotelo et al. 2008, 2009). M. brachydactyla...
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Introduction Among the many species of the genus Clarias , only C larias gariepinus is recognized for its potential for aquaculture (Janssen, 1990). The fish is native to Africa but it has been introduced and cultured in several countries in Asia, Europe and South America (Verreth et al., 1993). The fish possesses most of the biological criteria...
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PRICHEMIN MIX
Priya's PRICHEMIN MIX is a mineral supplement for aquaculture. It consists of a mix of mineral chelats from aminoacids
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“Using Genetic Markers To Improve Selection”
By: Paul Walker Thompson Date: April 13, 2016
Dr. Ken Stalder recently wrote an article in the “National Hog Farmer” describing how Gene Typing can be added to Phenotypic Traits to improve on Animal Selection in Pigs. As scientist can read Genotyping of 300 to 60,000 Gene Pairs, this can be combined with Measurable Physical Traits and Performances (Phenotypes) to better select for traits, especially those that are Low In Heritability. ...
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Introduction The future of aquaculture production, as in other animal production systems, is towards greater control of the physical, chemical and biological variables surrounding the production system. The trend from collection of wild fry to the development of hatcheries for fry production, from the use of wild spawners to the use of maturation systems and ultimately closing the reproductive cycle to use domesticated and selected stocks is clear. At the same time, there is an...
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Background Catfish is the major aquaculture species in the United States, accounting for over 60% of all US aquaculture production. While channel catfish ( Ictalurus punctatus ) accounts for the majority of commercial aquaculture production, the closely related blue catfish ( Ictalurus furcatus ) possesses several economically important traits that led to the production of an inter-specific hybrid (channel...
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INTRODUCTION The genus Artemia Leach, 1819 is cosmopolitan and includes seven species, with various geographically widespread strains (Triantaphyllidis et al., 1998). The origin of populations can be natural through cyst dispersal by water birds or wind, or artificial through inoculation of cysts in salt works (Sorgeloos et al., 1986). Artemia strains can be sexual, such as in the American and in some European and Asiatic...
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PRICHEMIN MIX
Priya's PRICHEMIN MIX is a mineral supplement for aquaculture. It consists of a mix of mineral chelats from aminoacids
Suggested link
INTRODUCTION The spotted rose snapper Lutjanus guttatus (Steindachner, 1869), is an important food and recreational species with high market prices of US$ 5-8 kg -1 and strong demand in America (Avilés-Quevedo et al. 2008, Boza-Barca et al. 2008). It is a batch spawner with asynchronous ovarian development and a long reproductive season...
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INTRODUCTION Spotted rose snapper Lutjanus guttatus (Steindachner, 1869), is an important food and recreational species that reaches high market prices (US$ 5-8/kg), with a strong demand in America (Avilés-Quevedo et al. 2008). In fact, most snapper species (Lutjanidae) have been over-exploited in wild fisheries (Watanabe et al. 2005,...
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Introduction Atlantic halibut (Hippoglossus hippoglossus L.) is a large, commercially valuable flatfish that is distributed throughout the North Atlantic (Haug 1990) and has excellent potential for production in aquaculture. Atlantic halibut aquaculture is still in its infancy and, since husbandry and production methods are not completely optimized, genetic contributions to halibut broodstock...
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The genus Artemia Leach, 1819 is a complex taxon with both sexual species and asexual populations. The asexual populations are considered as biological species " Artemia parthenogenetica Barigozzi, 1974" (BROWNE & BOWEN 1991). Since the reproductive mechanism of parthenogenetic Artemia is via parthenogenesis, males are rarly produced among these individuals. Therefore, they are introduced nowadays as "parthenogenetic Artemia ...
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PRICHEMIN MIX
Priya's PRICHEMIN MIX is a mineral supplement for aquaculture. It consists of a mix of mineral chelats from aminoacids
Suggested link
ABSTRACT
A field study was conducted on brood stock Nile tilapia to increase the propagation. Both sexes were individually stocked into Habas (enclosures) in an earthen pond and fed for 19 days on a basal diet supplemented with different additives at graded levels of each (0.5, 1.0 and 2.0 g Therigon ® ; 1.0, 2.0, and 3.0 g Nuvisol Hatch P ® ; 20, 40 and 60 mg...
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In the Potomac River, male smallmouth bass are growing eggs. This phenomenon now poses one of the most important water quality problems of our time. Five years of research has failed to uncover the chemical contaminants responsible for the abnormal sexual development of these fish. Nevertheless, we should not view this lack of a smoking gun as disempowering. Rather, it is a testimonial to the difficulty of the environmental problems we face today. These problems are solvable, but it will...
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The Southern Bluefin Tuna at Clean Seas Tuna's Arno Bay hatchery could be worth thousands in three years.
Weigh up to 50kg each, it will be a reminder of one of the most visionary primary production breakthroughs in Australia's history. It follows Clean Seas' world-first production of southern bluefin tuna fingerlings this summer.
About 250 fingerlings have been kept from this year's trial breeding program. Clean Seas Tuna chairman Hagen Stehr said the...
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Wild salmon are done spawning in the rivers for this year, but a few too many farmed salmon have escaped from their cages, spreading their roe and milt. As a result, some farmed salmon have crossed their genes with locally adapted wild salmon. How does this affect the ability of wild salmon to survive in the rivers?
Researchers at Nofima want to uncover the gene flow that actually occurs from farmed salmon to wild salmon.
16,000...
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PRICHEMIN MIX
Priya's PRICHEMIN MIX is a mineral supplement for aquaculture. It consists of a mix of mineral chelats from aminoacids
Suggested link
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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