Realized heritabilities and genetic correlation after dual selection for total weight and shell width in catarina scallop (Argopecten ventricosus)

Selection response and realized heritability for growth in three stocks of the Pacific oyster Crassostrea gigas

“…This is a level of improvement that is comparable to what has been reported in other bivalves. For instance, Newkirk and Haley [20] achieved similar responses to selection of 10-20% per generation in the European oyster Ostrea edulis, while genetic gains for growth of between 8 and 10% have been observed in various scallop experimental programs [4,5,19]. Hadley et al [8] also demonstrated the utility of mass Different letters indicate significant differences (P \ 0.05) among means Different letters within the same row indicate significant differences (P \ 0.05) among means selection as a way to increase growth rate in the hard clam Mercenaria mercenaria.…”

“…In the majority of bivalve species, improvement in growth rate has been the initial focus, since it will benefit the feed conversion rate and reduce the culture time. Most of the selection programs that have focused on improving the growth rate of commercially important bivalves have demonstrated encouraging results, including in scallops [4,5], mussels [6,7], clams [8], and particularly in some species of oysters [9][10][11][12].…”

Summer mortality of hatchery-produced Pacific oyster spat (Crassostrea gigas). I. Estimation of genetic parameters for survival and growth

“…The most frequently studied trait is growth, which represents almost 93% of genetic parameter estimations in marine mollusks (Dégremont, 2003). A large number of studies found significant heritability for juvenile and adult growth among a variety of clam, mussel, oyster and scallop species (Lannan, 1972;Haley et al, 1975;Wada, 1984Wada, , 1986Wada, , 1994Mallet et al, 1986;Strömgren and Nielsen, 1989;Hilbish, 1990, 1991;Newkirk, 1990, 1991;Crenshaw et al, 1991;Hadley et al, 1991;Hilbish et al, 1993;Jarayabhand and Thavornyutikarn, 1995;Toro et al, 1995;Crenshaw et al, 1996;Toro and Parades, 1996;Ibarra et al, 1999;Brichette et al, 2001;Ernande et al, 2003;Zheng et al, 2004). Even though survival is usually considered a trait difficult to improve through genetic selection (Gjedrem, 1985), a number of papers have reported a significant genetic basis for survival in C. gigas (Beattie et al, 1980;Hershberger et al, 1984, Soletchnik et al, 2002Ernande et al, 2004).…”

Growth performance and physiological parameters of the second generation selected and control groups of Pinctada martensii

“…For example, Toro and Newkirk (1990) reported that there existed a high genetic correlation between live weight and shell height in a group selected for live weight in O. edulis. In catarna scallop A. venricosus, Ibarra et al (1999) also reported a significantly correlated response for shell width when selection of total weight was performed, which implies a genetic correlation between the two traits. The present results that the second generation selected group had larger shell length and shell height than the control at different stages indicate there existed a positively genetic correlation between the shell traits of pearl oyster P. martensii.…”

“…Genetic correlations between growth traits in shellfish species have been estimated for Chile oyster O. chilensis (Toro et al, 1986), the European oyster O. edulis (Toro and Newkirk, 1990) and catarina scallop A. venttricosus (Ibarra et al, 1999). For example, Toro and Newkirk (1990) reported that there existed a high genetic correlation between live weight and shell height in a group selected for live weight in O. edulis.…”