Thumbnail Image

Inbreeding and brood stock management.

Year of publication 1999

Place of publication Rome, Italy ;

Pages 122 p.

Author Tave, D.

Publisher FAO ;

Product type Book (stand-alone)

ISBN 925104340X

Series title FAO Fisheries Technical Paper

Series number No. 392 - T392

Edition 1

Synopsis (short abstract) This manual, written for extension workers, aquaculturists, and those who work with natural resource management programmes, primarily deals with the problems caused by unwanted inbreeding in cultured fish populations and describes management techniques that can be used to prevent or minimize inbreeding. The manual also describes how inbreeding can be used to improve captive populations of fish. The manual contains chapters on: basic genetics and the genetics of inbreeding; how to determine indiv idual inbreeding values when pedigrees are known; how to determine the average inbreeding value in a population when pedigrees are not known; genetic drift, which is random changes in gene frequency; how inbreeding programmes can be used to improve cultured populations of food fish; how to prevent inbreeding depression and loss of genetic variance in farmed populations; and recommendations on how to manage cultured populations of fish to prevent unwanted inbreeding and genetic drift from depress ing productivity, profits, and survival. One of the most important aspects of managing a closed population of fish at a fish farm or fish culture station is the management of the population's effective breeding number, because inbreeding is inversely related to the effective breeding number. Techniques to determine and manage the effective breeding number are described, and recommended minimum effective breeding numbers are provided for a variety of farm sizes and fish culture goals. A number of culture techniques can affect inbreeding, and ways to modify them so there is minimal impact on inbreeding are discussed. Finally, ways to minimize inbreeding during selective breeding programmes are described.

Cite this content as:

Tave, D.Inbreeding and brood stock management.Fisheries Technical Paper. No. 392. Rome, FAO. 1999. 122p.

Language English

Also available in:
No results found.

Related items

Showing items related by metadata.

  • Thumbnail Image
    Book (stand-alone)
    International Conference on Domestication and Commercialization of Non-Timber Forest Products in Agroforestry Systems 1996
    Also available in:
    No results found.
    The International Conference on Domestication and Commercialization of Non-Timber Forest Products in Agroforestry Systems, hosted by ICRAF, was held in Nairobi, Kenya, from 19 to 23 February 1996. This was the first world-level meeting to be held exclusively to draw attention to issues dealing with domestication and commercialization of non-timber forest products in agroforestry systems.
  • No Thumbnail Available
    Project
    Islamic Republic of Iran Training Course in Coldwater Fish Culture
    Training Course in Coldwater Fisheries
    1989
    Also available in:
    No results found.
    The Islamic Republic of Iran has an established coldwater fish culture industry in both the private and public sectors, centred in the northern mountains close to the Caspian Sea and in other high areas of the country. Rainbow trout (Salmo gairderi) are grown to a market size of 250 g and above in conventional farms, predominantly using concrete raceways. Official 1987 production was 1 750 t from 20 licensed farms, but it is thought that unlicensed farms contribute about a further 1 000 t to the true total. The “Caspian salmon”, actually an anadromous trout (Salmo trutta), is grown in hatcheries to a size of 1–20 g before being released into the rivers and streams draining into the Caspian Sea. Demand for trout in Iran greatly exceeds domestic production. Consequently the Government is currently supporting a major programme to increase salmonid output, both by building state-owned hatcheries and on-growing units and by providing licences, land and juvenile fish to private farmers. Ex tension advice is also available through the Shilat (State fishery company). However, this rapid expansion of coldwater fish culture has resulted in a national shortage of trained people capable of managing trout farms or of providing an efficient extension service. In addition, there is a need for technical staff already actively working in the industry to update their knowledge. As no universities or colleges in Iran are presently equipped to offer specialized training in this field, the Gov ernment of the Islamic Republic of Iran requested FAO assistance in organizing and staffing a theoretical and practical training course in coldwater fish culture. Funding was agreed under FAO's Technical Cooperation Programme (project TCP/IRA/6755).
  • Thumbnail Image
    Book (stand-alone)
    Animal genetic resources - conservation and management 1981
    Also available in:
    No results found.
    The term "animal genetic resources" In used to include all broods, types, varieties and populations of animals that inhabit the earth under both improved and unimproved conditions. TLe conservation and management of these resources is a subject of great concern 'to both FAO and UNEP. Dr. Ralph W. Fbillips, Doputy Director-General of FAO has given an excellent summary of FAO activities In this area In the inaugural address which is Included in these proceedings. In the developed temperate zones of the world, the centuries of slow but effective selection by breeders, followed by the application of scientific brooding programmes during the present century have resulted in high levels of performance being achieved in a small number of breeds of each species. Thin eventually led to the replacement of many local low-producing broods in Europe and elsewhere by the high-producing "improver" breeds. The growing demand for animal products in warmer countries has led to this policy being follow ed world wide. Because of the case of replacing a population by artificial insemination (AI) there is a danger of genetic attrition m the scale that has already occured in Europe. Furthermore, this policy of massive grading-up in being applied in climates in which it may not be the most desirable. The genes can easily be imported (e.g. as semen), but the environment to which they are adapted in less easy to reproduce. In many cases a systematic crossbreeding programme In more appropriate than gr ading up to a temperate breed. Such a programme requires the retention of the local adapted breeds.
Show more

Users also downloaded

Showing related downloaded files

No results found.