scholarly journals Research Sampling and Survey Design for Sea Scallops (Placopecten magellanicus) on Georges Bank

1987 ◽  
Vol 7 ◽  
pp. 117-121 ◽  
Author(s):  
R K Mohn ◽  
G Robert ◽  
D L Roddick
Keyword(s):  
Survey Design ◽  
Georges Bank ◽  
Placopecten Magellanicus ◽  
Sea Scallops

Paralytic Shellfish Poison in Sea Scallops (Placopecten magellanicus, Gmelin)

1965 ◽  
Vol 22 (5) ◽  
pp. 1137-1149 ◽  
Author(s):  
N. Bourne
Keyword(s):  
Atlantic Coast ◽  
Bay Of Fundy ◽  
Georges Bank ◽  
Placopecten Magellanicus ◽  
Paralytic Shellfish Poison ◽  
Paralytic Shellfish ◽  
Adductor Muscles ◽  
Sea Scallops

Bioassays for paralytic shellfish poison were carried out in sea scallops (Placopecten magellanicus, Gmelin) from the major scallop producing areas off the Canadian Atlantic coast. There was very little or no toxin in Georges Bank or southern Gulf of St. Lawrence scallops. In Bay of Fundy scallops, adductor muscles and gills were poison-free but livers and mantles remained toxic the year round. The highest score of roes in these scallops was 43 μg of toxin per 100 g of roe.

Paralytic Shellfish Poison in Sea Scallops (Placopecten magellanicus) in the West Atlantic

1983 ◽  
Vol 40 (3) ◽  
pp. 313-318 ◽  
Author(s):  
G. S. Jamieson ◽  
R. A. Chandler
Keyword(s):  
Adductor Muscle ◽  
Bay Of Fundy ◽  
Georges Bank ◽  
Placopecten Magellanicus ◽  
Eastern Canada ◽  
The West ◽  
Monthly Basis ◽  
Sea Scallop ◽  
Paralytic Shellfish ◽  
Sea Scallops

Levels of Gonyaulax excavata toxin in sea scallop (Placopecten magellanicus) tissues were monitored in eastern Canada on a monthly basis between 1977 and 1981. All tissues but the adductor muscle were found to be highly toxic in Bay of Fundy scallops, with negligible toxicity observed in scallops from Georges Bank, the outer Scotian Shelf, and Northumberland Strait scallops. Level of Bay of Fundy toxicity was much higher than previously observed (maximum digestive gland toxicity: 150 000 μg/100 g in March 1978), and recent average monthly toxicity for Bay of Fundy scallop roe ranged from 184 to 286 μg/100 g. Considerable fluctuation in toxicity can occur between adjacent months, and peak toxicities in sea scallops occur during fail and winter months. Scallop roe fisheries should be permitted to be established for scallops fished from the northern part of Georges Bank and Northumberland Strait. However, a closed zone for scallop roe should be established in the Bay of Fundy and adjacent Scotian Shelf.Key words: scallop, PSP, Gonyaulax, Placopecten, mollusk

scholarly journals The impact of commercial fishing on the determination of habitat associations for sea scallops (Placopecten magellanicus, Gmelin)

2009 ◽  
Vol 66 (9) ◽  
pp. 2043-2051 ◽  
Author(s):  
Stephen J. Smith ◽  
Jerry Black ◽  
Brian J. Todd ◽  
Vladimir E. Kostylev ◽  
Mark J. Lundy
Keyword(s):  
Variance Reduction ◽  
Survey Design ◽  
Fishing Effort ◽  
Habitat Associations ◽  
Commercial Fishing ◽  
Placopecten Magellanicus ◽  
Bottom Type ◽  
Sea Scallops ◽  
The Impact

Abstract Smith, S. J., Black, J., Todd, B. J., Kostylev, V. E. and Lundy, M. J. 2009. The impact of commercial fishing on the determination of habitat associations for sea scallops (Placopecten magellanicus, Gmelin). – ICES Journal of Marine Science, 66: 2043–2051. The sea scallop (Placopecten magellanicus) population off southwestern Nova Scotia in Scallop Fishing Area 29 has been monitored by an annual drag survey since the fishery started there in 2001. A new stratification scheme based on surficial geology maps from a multibeam bottom mapping and geology ground-truth project completed in 2004 in the area have been used for survey design since 2005. Survey data from before 2005 have been post-stratified using the new strata. The efficiency of the design with respect to variance reduction appears to have diminished over time suggesting that the association between scallop abundance and bottom type may not have been as strong or constant as first assumed. Modelling of the association between scallop abundance and bottom type and depth using a Bayesian hierarchical approach confirms this diminishing relationship. Comparison of the results from the model with spatial measures of fishing effort based on satellite vessel monitoring data suggests that increasing exploitation may be masking the relationships as scallop beds are targeted and fished down. These results could have implications on the interpretation of species habitat associations from areas where data are only available from periods when the populations have been exploited over a long time. In these cases, the spatial distribution of fishing effort may be a better indicator of species habitat associations than the estimates from surveys.

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