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Phenotypic estimates and heritability values of Artemia franciscana

By M M Shirdhankar, P C Thomas and S K Barve

Abstract

Artemia, in all stages of its life cycle, is suitable food\ud for most diversi¢ed groups of aquatic animals.\ud Although its size at different stages restricts its use\ud as a food for some groups of ¢sh, this problem can be\ud overcome using selective breeding techniques. The\ud formulation of any selective breeding programme\ud calls for a proper understanding of the genetic architecture\ud of the economically important traits of the\ud population under study. Thus, heritability for certain\ud important life history and reproductive traits was estimated\ud in Artemia franciscana from the Great Salt\ud Lake, Utah. In the present study, the sexwise heritability\ud values for growth and reproduction traits\ud were estimated using parent offspring regression.\ud The phenotypic parameters for the same traits are\ud also recorded. The naupliar length was 487.072.0\ud and 490.671.8 mm for males and females, respectively,\ud whereas the heritability values for naupliar\ud length were 0.585170.2153 and 0.376670.1899\ud respectively. The length at 3 and 6 days of age were\ud 1.8770.03 and 4.1070.08mm, respectively, for\ud maleswhereas1.8770.03 and 4.3070.08mm, respectively,\ud for females.The heritability values for length at\ud 3 and 6 days of age for males were 0.327270.3651\ud and 0.496570.2466, respectively, whereas the respective\ud values for the females were 0.116770.3841\ud and 0.022270.2971. The estimates of length at ¢rst\ud brood, pre-reproductive period and number of o¡-\ud spring in ¢rst brood were 10.0970.23mm, 16.007\ud 0.23 days and 53.5771.37 days, respectively, whereas\ud the heritability values for respective traits were\ud 0.040370.1078,0.323470.2874 and 0.340470.2202

Topics: Artemia
Publisher: Blackwell Publishing
Year: 2004
OAI identifier: oai:eprints.cmfri.org.in:5822

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