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Effect of larval density and algal concentration on growth, survival and feeding rates of the scallop Nodipecten subnodosus (Sowerby, 1835)
Author(s) -
AngelDapa Marco A.,
NavaGómez Gabriel E.,
LópezGalindo Laura,
CarpizoItuarte Eugenio,
CastellanosMartínez Sheila,
CorreaReyes Gabriel,
GarciaEsquivel Zaul
Publication year - 2021
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.15311
Subject(s) - scallop , biology , larva , stocking , zoology , ingestion , hatchery , allometry , fishery , ecology , endocrinology , fish <actinopterygii>
Abstract 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 µm d −1 ) observed at 5 larvae ml −1 . Mean GGR of 6.1 to 6.9 µm 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 .