4.5 Article

Effect of larval density and algal concentration on growth, survival and feeding rates of the scallop Nodipecten subnodosus (Sowerby, 1835)

Journal

AQUACULTURE RESEARCH
Volume 52, Issue 10, Pages 4776-4785

Publisher

WILEY
DOI: 10.1111/are.15311

Keywords

clearance rate; feeding physiology; larval growth; ingestion rate; scallop larvae

Categories

Funding

  1. Consejo Nacional de Ciencia y Tecnologia [PN-2017-5404]

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The research found that larvae of Nodipecten subnodosus scallops can reach maximum growth rate at stocking densities from 5 to 15 larvae ml(-1) if fed 45,000 to 60,000 cells ml(-1).
The scallop Nodipecten subnodosus is the largest pectinid species targeted in Mexico for hatchery seed production. Thus, effects of larval density (LD = 5, 10 and 15 ml(-1)) and food concentration (FC = 15,000; 30,000; 45,000 and 60 cells ml(-1)) were assessed on survival (S) and growth. Clearance (CR) and ingestion rates (IR) were also studied. Lowest S was observed at 15,000 cells ml(-1) (19%-22%), while S > 50% prevailed at >= 30,000 cells ml(-1). Both LD and FC significantly affected gross growth rate (GGR), with maximal values (7.3 mu m d(-1)) observed at 5 larvae ml(-1). Mean GGR of 6.1 to 6.9 mu m d(-1) was recorded at 10-15 larvae ml(-1) and 45,000 to 60,000 cells ml(-1). Maximal CR (13.8-23 ml larva(-1) h(-1)) was recorded at 15 cells ml(-1). Ingestion rates increased as FC increased, reaching asymptotic values (9.7-11.5 cells larva(-1) min(-1)) at 45,000 and 60,000 cells ml(-1). Allometric IR-Shell height exponents increased (b = 1.1 to 1.9) as FC increased. The combined results suggest that N. subnodosus larvae may be reared at stocking densities from 5 to 15 larva ml(-1) and reach maximal GGR if fed 45,000 to 60,000 cells ml(-1).

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