Stocking density effects on larval growth and survival of two catarina scallop, Argopecten ventricosus (= circularis) (Sowerby II, 1842), populations

Abstract

Two populations of catarina scallop, Argopecten ventricosus (= circularis) (Sowerby n, 1842), were evaluated for their larval growth and survival responses to different stocking densities. Larvae from the Magdalena population had a significantlj' higher growth but equal survival at a density of 10 larvae ml"^ compared with 20 larvae ml'^ Larvae from the Concepcion population grew better at densities of 15 and 20 larvae ml"t han at densities of 5 and 10 lan^ae mr^ although survival was lower at higher densities.The differing response of these two populations to increased stocking densities is explained as a possible consequence of different population adaptations related to behavioural and physiological mechanisms. The importance of establishing optimum stocking densities for moUuscan larvae is stressed in two contexts: maximizing growth and survival for different populations when artificially reared, and understanding the effects of stocking densities on phenotypic variance, especially during the course of genetic studies.

Experimental larval culture of the Caribbean scallops Argopecten nucleus and Nodipecten nodosus

“…Nevertheless, the absence of a significant effect of density on the survival of N. nodosus larvae suggests that this species is less susceptible to crowding than A. nucleus . A similar response has been observed in Chlamys varia (Linnaeus 1758) (Acosta & Álvarez 1990) and in Argopecten ventricosus (Sowerby 1842) (Ibarra et al . 1997).…”

“…Among these are the amounts of food to be delivered to the culture (MacDonald 1988; Lu & Blake 1996), the type of food (Krupski, Tetrault & Patricio 1998; Uriarte & Farías 1999; Uriarte, Farías, Navarro, Cancino, Gajardo & Sorgeloos 2001a; Navarte & Pascual 2003; Pernet & Tremblay 2004), the manner in which food is distributed (Martínez, Cáceres, Uribe & Díaz 1995), the temperature (MacDonald 1988; Acosta & Álvarez 1990; Uriarte et al . 2001a), the larval density (MacDonald 1988; Acosta & Álvarez 1990; Ibarra, Ramírez & García 1997) and the presence of pathogenic microorganisms in the water (DiSalvo, Blecka & Zebal 1978; Luna‐González et al . 2002).…”

Spawning Induction, Fecundity Estimation, and Larval Culture ofSpondylus calcifer(Carpenter, 1857) (Bivalvia: Spondylidae)

“…We approached spawn induction and culture of S. calcifer larvae under hatchery conditions using methodologies commonly used in the production of pectinid species (Delaunay et al 1993, Ibarra et al 1997, Laing 2002, Christophersen & Strand 2003, Martı´nez & Pe´rez 2003, Narvarte & Pascual 2003.…”

Influence of stocking density and temperature on early development and survival of the purple sea urchin,Strongylocentrotus purpuratus(Stimpson, 1857)

“…The optimum rearing density of planktotrophic larvae is crucial as over‐crowding may limit both swimming space and access to food resources and can lead to low dissolved oxygen and high nitrogenous waste concentrations – all of which may lead to reduced overall development and survival rates (Wang & Widdows ; Tomasso ; Ibarra, Ramirez & Garcia ; Doroudi & Southgate ). In scientific studies, echinoid larvae are typically reared at a density of ≤2 ind mL −1 (see review by Azad et al .…”