Identification of Planktonic Sea Scallop Larvae (Placopecten magellanicus) (Gmelin)

1987 ◽  
Vol 44 (7) ◽  
pp. 1361-1366 ◽  
Author(s):  
M. J. Tremblay ◽  
L. D. Meade ◽  
G. V. Hurley
Keyword(s):  
Bay Of Fundy ◽  
Placopecten Magellanicus ◽  
Sea Scallop ◽  
Bivalve Larvae ◽  
Scallop Larvae ◽  
Shape And Size

Methods for the collection, processing, and identification of planktonic sea scallop larvae (Placopecten magellanicus) (Gmelin) are described. Bivalve larvae collected from the Bay of Fundy were compared with cultured P. magellanicus larvae. Sea scallop larvae collected from the plankton can be tentatively identified based on shape and size; examination of the larval hinge structure allows confirmation.

Paralytic Shellfish Toxins in the Sea Scallop, Placopecten magellanicus, in the Bay of Fundy

1979 ◽  
Vol 36 (1) ◽  
pp. 32-36 ◽  
Author(s):  
C. P. Hsu ◽  
A. Marchand ◽  
Y. Shimizu ◽  
G. G. Sims
Keyword(s):  
Key Words ◽  
Bay Of Fundy ◽  
Placopecten Magellanicus ◽  
Toxic Dinoflagellate ◽  
Paralytic Shellfish Poison ◽  
Shellfish Toxins ◽  
Sea Scallop ◽  
Paralytic Shellfish Toxins ◽  
Paralytic Shellfish ◽  
A Minor

The paralytic shellfish poison of the giant sea scallop, Placopecten magellanicus (Gmelin), from the Bay of Fundy has been analyzed. Of eight toxins isolated, seven were identified with those previously recognized in various sources including the Atlantic toxic dinoflagellate, Gonyaulax tamarensis cells. The major components were gonyautoxin-I, gonyautoxin-II, and neosaxitoxin; saxitoxin was responsible for only a very small portion of the total toxicity. A minor toxin that was eluted between neosaxitoxin and saxitoxin in the chromatography system was found to be new and designated as gonyautoxin-VII. Key words: paralytic shellfish poisons, gonyautoxins, neosaxitoxin, Gonyaulax tamarensis

Fourier Analysis of Sea Scallop (Placopecten magellanicus) Shells in Determining Population Structure

1994 ◽  
Vol 51 (2) ◽  
pp. 348-356 ◽  
Author(s):  
E. L. Kenchington ◽  
W. E. Full
Keyword(s):  
Shell Shape ◽  
Bay Of Fundy ◽  
Shape Descriptors ◽  
Placopecten Magellanicus ◽  
Harmonic Numbers ◽  
Sea Scallop ◽  
Species Comparisons ◽  
Sea Scallops ◽  
Post Hoc ◽  
Fourier Harmonics

Sea scallops (Placopecten magellanicus) were sampled from each of four scallop beds: the northeast peak of Georges Bank, Western Bank, St. Pierre Bank, and the Bay of Fundy near Digby, N.S. The outlines of scallop top shells were captured by video imagery using a semiautomated approach. Fourier shape descriptors were calculated and analyzed. Age and year-class effects were shown to be important factors influencing scallop shell shape. Allometric effects on Fourier harmonics also have a significant influence on shell shape in this species. Comparisons of Fourier harmonics between scallop beds separated by age and sampling year, and corrected for allometry, revealed significant differences in the majority of harmonic numbers. Post hoc analyses identified St. Pierre Bank and the Bay of Fundy as being significantly different from the other beds in a suite of separate analyses.

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

Planktonic Sea Scallop Larvae (Placopecten magellanicus) in the Georges Bank Region: Broadscale Distribution in Relation to Physical Oceanography

1992 ◽  
Vol 49 (8) ◽  
pp. 1597-1615 ◽  
Author(s):  
M. John Tremblay ◽  
Michael Sinclair
Keyword(s):  
Larval Abundance ◽  
Physical Oceanography ◽  
Georges Bank ◽  
Placopecten Magellanicus ◽  
Physical Processes ◽  
Scotian Shelf ◽  
Northern Flank ◽  
Sea Scallop ◽  
Scallop Larvae ◽  
The Mean

During autumn surveys for sea scallop larvae (Placopecten magellanicus) from 1985 to 1987, the mean abundance of sea scallop larvae on the northeast part of Georges Bank (1201–20080∙m−2) was much greater than on the southern Scotian Shelf (5–240∙m−2). Few larvae were collected between these two areas, and exchange between Georges Bank and the Scotian Shelf appears very limited. Transects across the northern flank in 1988 revealed peaks in larval abundance when on-bank temperature stratification was high. Relative larval abundance on the transects was positively related to the speed of the along-front current, suggesting physical convergence of larvae. The on-bank retention of scallop larvae on Georges Bank appears to be due to physical processes alone, since scallop larvae undertake only limited diel vertical migration. Larval exhange among adult scallop aggregations on Georges Bank (the northeast peak, the southeast part, and the South Channel) is probable, but evidence from this study is limited. The autumn production of late-stage larvae on the northern flank and northeast peak of Georges Bank is estimated to range from 120 to 1500∙m−2, which is 10–100 times greater than the density of scallops aged 1–2 yr.

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