Modalities of brooding and morphogenesis of larvae in Ostrea puelchana (D'Orbigny) under experimental rearing

Abstract

Ostrea puelchana is a larviparous oyster from the S.W. Atlantic coasts. This species is not being commercially exploited at present. Because of its high food qualities, however, it may constitute a resource of economic interest in the future.Until now larval development and characteristics of the incubation period have been poorly known. This study describes the characteristics of the mode of brooding under laboratory rearing conditions and, using scanning electron microscopy, the morphogenesis of the hinge until larval release from the parents.The larva develops two anterior and two posterior denticles during brooding. A comparison with larvae of other species of the genus Ostrea reveals that the main differences among them do not lie so much in the pattern of hinge dentition as in the rate of evolution of the hinge components, which is faster in Ostrea puelchana. This species has fully developed denticles at the time of release, which places the larva of this oyster as particularly evolved within the genus Ostrea.

Scanning Electron Microscopic Aids for Identification of Larval and Post-Larval Bivalves

“…The results of the study by Hu et al (1993), when combined with those of previous studies on Crassostrea angulata (Pascual 1971), Crassostrea ariakensis (Tanaka 1980), Crassostrea glomerata (Dinamani 1973), Crassostrea iredalei (Ver 1986), Ostrea denselamellosa (Tanaka 1980), Ostrea lurida (Loosanoff et al 1966), Ostrea permollis (Forbes 1967), Ostrea puelchana (Castro & Le Pennec 1988), Ostrea stentina (Pascual 1972), and Ostrea spp. (Chanley & Dinamani 1980), illustrate that the morphological differences between early ontogenetic stages of species within the genus Crassostrea and those within the genus Ostrea are quite striking.…”

Shell morphology and identification of early life history stages of congeneric species of Crassostrea and Ostrea

“…Adult oysters used in this study were collected during the natural spawning season of each species from the following sources: (1) Crassostrea gigas (Thunberg) from the spawning stocks of the Coast Oyster Company, Quilcene, Washington, in 1989 and1990; (2) C. virginica (Gmelin) from Delaware Bay, New Jersey, in 1980 and1987; (3) Ostrea edulis L. from the spawning stocks of the Darling Center of the University of Maine in Walpole, Maine, in 1980 and1988;and (4) O. equestris Say from Newport River Estuary, North Carolina, in 1989. Spawning of adults and culture of larval and post-larval specimens took place at the following laboratories: the Cape Shore Laboratory of Rutgers University, located on Delaware Bay in Cape May County, New Jersey (C. gigas and C. virginica); the Darling Center, Walpole, Maine (O. edulis); and the Eastern Shore Laboratory of the Virginia Institute of Marine Science in Wachapreague, Virginia (C. gigas, C. virginica, O. edulis, and O. equestris).…”

Life History Traits Conferring Larval Resistance against Ocean Acidification: The Case of Brooding Oysters of the Genus Ostrea

“…(Table 1). For example, Ostrea puelchana may only brood the young for 3-9 days (Castro & Le Pennec 1988); (1985) Question marks either indicate unknown information or hypothesized larval developmental mode.…”