Open AccessDivergent Selection for Shell Length in the Manila Clam, Ruditapes philippinarum
Author(s) -
Zhao Liqiang,
Yan Xiwu,
Huo Zhongming,
Yang Feng,
Zhang Guofan
Publication year - 2012
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.2012.00612.x
Subject(s) - ruditapes , biology , heritability , selection (genetic algorithm) , control line , population , juvenile , fishery , selective breeding , ecology , line (geometry) , zoology , genetics , mathematics , demography , engineering , geometry , transmission line , artificial intelligence , sociology , computer science , electrical engineering
To determine whether genetic improvement could be attained through a selective breeding programme, divergent selection for shell length was conducted in a base population of the Manila clam, Ruditapes philippinarum . The 10% largest and 10% smallest clams were selected as parents for the upward‐selected and downward‐selected lines, respectively. Equal numbers of clams were randomly chosen to serve as parents for the control line before the selection. The selected and control lines were reared under the same environmental conditions at larvae, juvenile, and grow‐out stages. The values of standardized responses to selection (SR) and realized heritability (at the age of 360 d were 0.268 and 0.165 for the upward‐selected line and 0.341 and 0.260 for the downward‐selected line, respectively. Asymmetric differences were evident between the upward‐selected and downward‐selected lines in both SR and. Performance in shell length is improved by 3.55% in the upward‐selected line after one generation, indicating that mass selection for shell length in a base population of the Manila clam, R. philippinarum , is effective and encouraging.