scholarly journals Impacts of habitat, predators, recruitment, and disease on soft-shell clams Mya arenaria and stout razor clams Tagelus plebeius in Chesapeake Bay

2018 ◽  
Vol 603 ◽  
pp. 117-133 ◽  
Author(s):  
CN Glaspie ◽  
RD Seitz ◽  
MB Ogburn ◽  
CF Dungan ◽  
AH Hines
Keyword(s):  
Chesapeake Bay ◽  
Mya Arenaria ◽  
Soft Shell ◽  
Razor Clams

Microbiological Studies of Chesapeake Bay Soft-shell Clams (Mya arenaria)

1990 ◽  
Vol 53 (12) ◽  
pp. 1052-1057 ◽  
Author(s):  
TUU-JYI CHAI ◽  
TZYY-JAN HAN ◽  
RALPH R. COCKEY ◽  
PATRICIA C. HENRY
Keyword(s):  
Chesapeake Bay ◽  
Microbiological Quality ◽  
Total Coliform ◽  
Mya Arenaria ◽  
Fecal Coliforms ◽  
Plate Count ◽  
Geometric Means ◽  
Standard Plate Count ◽  
Soft Shell ◽  
Standard Plate

A total of 472 samples of soft-shell clams (Mya arenaria), collected from three major clam harvest areas in the Chesapeake Bay and dockside check stations, was analyzed for standard plate count (SPC), total coliforms, fecal coliforms, Escherichia coli, and coliphages. SPC increased during the summer season. SPC geometric means of 2.6 × 104, 6.9 × 104, and 7.2 × 104/g, respectively, were found in three major harvest areas. Fecal coliforms remained relatively stable with geometric means of 30, 54, and 62/100 g. As seasonal temperatures increased, the total coliform geometric means declined slightly ranging from 1,500 to 6,300/100 g. E. coli means were low (< 27/100 g). The occurrence and levels of male-specific coliphages were also low and did not correlate with bacteriological quality. No significant microbiological quality difference was found between soft-shell clams sampled from harvest waters and check stations. Results indicate that the microbiological quality of soft-shell clams either at harvest or check stations was satisfactory.

BACTERIOLOGICAL STUDIES ON THE SHELF LIFE1 OF SOFT SHELL CLAMS (Mya arenaria)

1965 ◽  
Vol 28 (2) ◽  
pp. 32-35 ◽  
Author(s):  
J. R. Cox
Keyword(s):  
Chesapeake Bay ◽  
Seasonal Changes ◽  
Mya Arenaria ◽  
Fecal Coliforms ◽  
E Coli ◽  
Soft Shell ◽  
Standard Plate ◽  
Plate Counts ◽  
Early Fall ◽  
Shelf Life Studies

Summary Bacteriological shelf life studies on fresh packed soft shell clams harvested from Chesapeake Bay were conducted at three month intervals to determine the effect of seasonal changes on standard plate counts, 25 C plate counts, coliform most probable numbers, and other microflora in relation to spoilage and discoloration. The data obtained in these studies indicate the following: (a) no correlation between either standard or 25 C plate counts and the degree of spoilage was noted; (b) coliforms multiply in shucked soft shell clams caught in cold waters and stored at 33–35 F, but may decrease during storage when harvested from warmer waters; (c) there may be a slight increase followed by a decrease in E. C.+ and E. coli (fecal coliforms) most probable numbers after 5–7 days storage, but when E.C.+ MPN's have been very low or 0 no increase has been found; (d) no correlation between pink yeast counts and pink discoloration of soft shell clams, or between any chromogenic bacteria or other discolorations was noted; and (e) the bacteriological standards for fresh shucked oysters which are based on E.C.+ MPN's (fecal coliforms) and standard plate counts were met although some counts were in the “Acceptable on Condition” classification when sampling was made during summer and early fall.

scholarly journals Impacts of predators, habitat, recruitment, and disease on soft-shell clamsMya arenariaand stout razor clamsTagelus plebeiusin Chesapeake Bay

2017 ◽  
Author(s):  
Cassandra N. Glaspie ◽  
Rochelle D. Seitz ◽  
Matthew B. Ogburn ◽  
Christopher F. Dungan ◽  
Anson H. Hines
Keyword(s):  
Chesapeake Bay ◽  
Habitat Loss ◽  
Temporal Dynamics ◽  
Influential Factors ◽  
Mya Arenaria ◽  
Environmental Preferences ◽  
Environment Temperature ◽  
Soft Shell ◽  
Parasitic Protist ◽  
Major Factors

ABSTRACTSoft-shell clams,Mya arenaria, and razor clams,Tagelus plebeius, in Chesapeake Bay have declined since the 1970s, with severe declines since the 1990s. These declines are likely caused by multiple factors including warming, predation, habitat loss, recruitment limitation, disease, and harvesting. A bivalve survey in Chesapeake Bay examined influential factors on bivalve populations, focusing on predation (crabs, fish, and cownose rays), habitat (mud, sand, gravel, shell, or seagrass), environment (temperature, salinity, and dissolved oxygen), recruitment, and disease.M. arenariaandT. plebeiuswere found more often in habitats with complex physical structures (seagrass, shell) than any other habitat. Pulses in bivalve density associated with recruitment were attenuated through the summer and fall when predators are most active, indicating that predators likely influence temporal dynamics in these species. Presence ofMya arenaria,which is near the southern extent of its range in Chesapeake Bay, was negatively correlated with water temperature. Recruitment ofM. arenariain Rhode River, MD, declined between 1980 and 2016. Infection by the parasitic protistPerkinsussp. was associated with stressful environmental conditions, bivalve size, and environmental preferences ofPerkinsussp, but was not associated with bivalve densities. It is likely that habitat loss, low recruitment, and predators are major factors keepingT. plebeiusandM. arenariaat low densities in Chesapeake Bay. Persistence at low densities may be facilitated by habitat complexity (presence of physical structures), whereas further reductions in habitats such as seagrass and shell hash could result in local extinction of these important bivalve species.

Soft Shell Clams (Mya arenaria) Contribute to Macroalgal Blooms in a Partially-restored Gulf of Maine Back-barrier Lagoon

2014 ◽  
Vol 32 (1) ◽  
pp. 46-58 ◽  
Author(s):  
R. K. Thiet ◽  
S. M. Smith ◽  
V. Rubino ◽  
R. Clark ◽  
K. Lee ◽  
...  
Keyword(s):  
Gulf Of Maine ◽  
Mya Arenaria ◽  
Macroalgal Blooms ◽  
Soft Shell

Transport of recently settled soft-shell clams (Mya arenaria L.) in laboratory flume flow

1995 ◽  
Vol 187 (1) ◽  
pp. 13-26 ◽  
Author(s):  
Curtis Roegner ◽  
Carl André ◽  
Mats Lindegarth ◽  
James E. Eckman ◽  
Jonathan Grant
Keyword(s):  
Mya Arenaria ◽  
Soft Shell ◽  
Laboratory Flume

Physical properties of soft shell clams, Mya arenaria

2008 ◽  
Vol 38 (3) ◽  
pp. 181-188 ◽  
Author(s):  
F.W. Wheaton ◽  
G.U. Schaffer ◽  
A.L. Ingling ◽  
L.W. Douglass
Keyword(s):  
Physical Properties ◽  
Mya Arenaria ◽  
Soft Shell

Southern limit of distribution of the soft-shell clam Mya arenaria on the Atlantic East Coast

2009 ◽  
Vol 12 (3) ◽  
pp. 429-432 ◽  
Author(s):  
Anxo Conde ◽  
Júlio Novais ◽  
Jorge Domínguez
Keyword(s):  
East Coast ◽  
Mya Arenaria ◽  
Southern Limit ◽  
Soft Shell Clam ◽  
Soft Shell

A tumor on the siphons of a soft-shell clam, Mya arenaria

1968 ◽  
Vol 11 (3) ◽  
pp. 504-506 ◽  
Author(s):  
Gilbert B. Pauley ◽  
Thomas C. Cheng
Keyword(s):  
Mya Arenaria ◽  
Soft Shell Clam ◽  
Soft Shell
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