SALTONSTALL KENNEDY GRANT PROGRAM
Polyculture of Sea Scallops Suspended from....
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GRANT NUMBER: NA46FD00327           NMFS NUMBER:  93-NER-009

REPORT TITLE: Polyculture of Sea Scallops Suspended From Salmon Net Pens

AUTHOR:  New England Fisheries Development Assoc., Inc.

PUBLISH DATE:  September 1996

AVAILABLE FROM:  National Marine Fisheries Service, Northeast Region, One Blackburn Drive, Gloucester, MA 01930-2298.  PHONE: (978) 281-9267

ABSTRACT

This project demonstrated that sea scallops (Placopecten magellanicus, initial size 10 mm) held in pearl nets adjacent to salmon net pens can grow to market size (60-70 mm) in 22 months.  Growth rates of 0.09 and 0.10 mm/day were attained at the two sites in Northeastern Maine, and were as high as 0.12 mm/day during the first 16 months. Neither accelerated nor decelerated growth due to the scallops being held in close proximity to the salmon pens was evident. Mean shell heights were significantly different with the depth of the pearl nets, however, no consistent pattern of shell height with depth was apparent.  Overall survival of scallops held in pearl nets was 64.3% and 66.2% at the two sites. Periodic testing for PSP toxins indicated that scallops grown in the area studied would be unlikely candidates for sale in whole animal or roe-on markets.   Farm-raised scallops were not significantly different from commercial scallops in taste and texture, and would be an acceptable product to consumers. Improvements in methodology need to be made before scallops can be raised in polyculture with salmon in a cost effective manner. Methods to improve the economics are discussed, such as decreasing labor costs and increasing growth rates of scallops. This study demonstrated good growth of scallops, a new use for a previously unutilized space, and a possible way for fish farmers to diversify.

 
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