Growth of triploid oyster, Crassostrea madrasensis (Preston)

Abstract

The performance of I and II meiotic triploids and control oysters (Crassostrea madrasensis) reared at Tuticorin Bay was compared to determine if the improvements in the growth of edible oysters were additive to faster growth in triploids. After a grow-out period of 12 months, both mean whole weights and shell heights were in order I meiotic triploid4II meiotic triploid4control. Mean whole weights and shell height of di¡erent oyster lines were all signi¢cantly di¡erent (Po0.05). On an average, larger morphological traits indicated that growth improvements from triploids were additive, and throughout the study triploid oysters maintained faster growth rate than their diploid siblings. Condition index and adductor muscle diameter of both triploids were higher than those of control.

Reproductive effort and growth in Crassostrea gigas: comparison of young diploid and triploid oysters issued from natural crosses or chemical induction

“…Methods inhibiting polar body expulsion using cytochalasin B or 6-DMAP (Gérard et al 1999) were developed first for triploid induction and allowed diploid -triploid comparisons to be made (e.g. for oysters see Allen & Downing 1986, Kesarcodi-Watson et al 2001, Mallia et al 2006; for mussels see Beaumont et al 1995, Brake et al 2004; for clams see Guo & Allen 1994a; for scallops see Tabarini 1984, Racotta et al 2008. More recently, the production of tetraploid oysters (Guo & Allen 1994b, Eudeline et al 2000a, McCombie et al 2005b) has led to a large increase in the aquaculture of triploid oysters produced by mating tetraploid with diploid parents .…”

Reduced Genetic Variation and Decreased Effective Number of Breeders in Five Year-Classes of Cultured Geoducks (Panopea generosa)

“…Sterility can be conferred on shellfish via triploid induction, and triploid shellfish have been used extensively in aquaculture because they exhibit reduced or absent gametogenesis and often show increased growth (Brake et al 2004, Nell & Perkins 2005, Mallia et al 2006). Triploidy techniques developed for geoducks (Vadopalas & Davis 2004) appear to confer sterility (Vadopalas & Davis, unpublished) and are currently undergoing further evaluation.…”

Effects of salinity and temperature on the timing of germinal vesicle breakdown and polar body release in diploid and triploid Hong Kong oysters, Crassostrea hongkongensis , in relation to tetraploid induction

“…However, normal diploid oysters suffer from low meat quality and slow growth during the sexual maturation period, due to high energy reallocation from somatic growth to reproduction (Downing & Allen, ). One method of solving these problems for the Hong Kong oyster industry is culture triploid oysters (Degremont, Garcia, Frank‐Lawale, & Allen, ; Mallia, Muthiah, & Thomas, ). There are several advantages to triploid oysters, such as superior growth, sterility, and high meat quality throughout the whole year.…”