Field evaluation of the effect of current velocity and direction on the growth of the giant scallop, Placopecten magellanicus, in suspended culture

Michel R. Claereboudt, John H. Himmelman, Jean Côté

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We measured the growth of juvenile giant scallops Placopecten magellanicus glued to panels and placed inside or outside of pearl nets in the water column at two sites where environmental conditions were similar except for a twofold differences in the current velocity (mean velocity <0.9 and > 0.16 m · s-1, respectively). We did not detect differences in growth related to the orientation of scallops relative to current direction and this contrasts with several studies examining the effect of steady current velocities in flumes. For scallops outside of pearl nets, daily specific growth rate of the shell was similar at the two sites, however, the mass of the shell, muscle and remaining viscera, scaled to shell height, was greater under weak than strong current. Pearl nets decreased water flow by 46-61%. At the strong current site, tissue masses were greater for scallops inside than outside the pearl net, probably because the net reduced the frequency of velocities which inhibit feeding. In contrast, at the weak current site, tissue masses were less inside the pearl net, probably because flow was slowed to the extent that seston depletion limited growth. Aquaculture methods must be adapted to hydrodynamic conditions to optimize growth.

Original languageEnglish
Pages (from-to)27-39
Number of pages13
JournalJournal of Experimental Marine Biology and Ecology
Volume183
Issue number1
DOIs
Publication statusPublished - Oct 27 1994

Fingerprint

suspended culture
Placopecten magellanicus
pearls
scallops
shell (molluscs)
shell
aquaculture method
seston
current velocity
animal organs
water flow
muscle
specific growth rate
water column
hydrodynamics
environmental conditions
aquaculture
effect
evaluation
muscles

Keywords

  • Aquaculture
  • Current direction
  • Current velocity
  • Growth
  • Scallop

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

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AB - We measured the growth of juvenile giant scallops Placopecten magellanicus glued to panels and placed inside or outside of pearl nets in the water column at two sites where environmental conditions were similar except for a twofold differences in the current velocity (mean velocity <0.9 and > 0.16 m · s-1, respectively). We did not detect differences in growth related to the orientation of scallops relative to current direction and this contrasts with several studies examining the effect of steady current velocities in flumes. For scallops outside of pearl nets, daily specific growth rate of the shell was similar at the two sites, however, the mass of the shell, muscle and remaining viscera, scaled to shell height, was greater under weak than strong current. Pearl nets decreased water flow by 46-61%. At the strong current site, tissue masses were greater for scallops inside than outside the pearl net, probably because the net reduced the frequency of velocities which inhibit feeding. In contrast, at the weak current site, tissue masses were less inside the pearl net, probably because flow was slowed to the extent that seston depletion limited growth. Aquaculture methods must be adapted to hydrodynamic conditions to optimize growth.

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