Digenean parasite communities in flatfishes of the Scotian Shelf and southern Gulf of St. Lawrence

1982 ◽  
Vol 60 (11) ◽  
pp. 2804-2811 ◽  
Author(s):  
J. S. Scott
Keyword(s):  
Feeding Behavior ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Parasite Prevalence ◽  
Winter Flounder ◽  
Fish Length ◽  
Pseudopleuronectes Americanus ◽  
Scotian Shelf ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea

Prevalence of digenean parasites in four major flatfishes of the Scotian Shelf and southern Gulf of St. Lawrence, American plaice (Hippoglossoides platessoides), yellowtail flounder (Limanda ferruginea), witch flounder (Glyptocephalus cynoglossus), and winter flounder (Pseudopleuronectes americanus), is compared between hosts in relation to geographic distribution, season, feeding behavior, and fish length. The 13 parasite species indicate overlap of feeding habits among hosts but also considerable diversity in feeding behavior, supporting the evidence from examination of stomach contents. Prevalence of digeneans in different final hosts varied between geographic areas and may be used to characterize the populations of the comparatively sedentary flatfish populations. Seasonal variation in prevalence was consistent from area to area but differed between parasites, from the expected increase in summer in some, concomitant with increased feeding, to a winter increase in others, probably related to a seasonal change of diet. Fish length had little effect on parasite prevalence in yellowtail flounder and witch flounder but had a notable effect on plaice and winter flounder from the Gulf of St. Lawrence, again apparently related to change of diet.

Feeding chronology and daily ration calculations for winter flounder (Pseudopleuronectes americanus), American plaice (Hippoglossoides platessoides), and ocean pout (Macrozoarces americanus) in Passamaquoddy Bay, New Brunswick

1987 ◽  
Vol 65 (3) ◽  
pp. 499-503 ◽  
Author(s):  
J. Stevenson Macdonald ◽  
Kenneth G. Waiwood
Keyword(s):  
Consumption Rate ◽  
Winter Flounder ◽  
Analysis Of Covariance ◽  
Fish Length ◽  
Benthic Fish ◽  
Daily Ration ◽  
Pseudopleuronectes Americanus ◽  
Gastric Evacuation ◽  
Passamaquoddy Bay ◽  
Hippoglossoides Platessoides

Feeding chronologies of three species of cohabiting benthic fish, winter flounder (Pseudopleuronectes americanus), ocean pout (Macrozoarces americanus), and American plaice (Hippoglossoides platessoides), are described. The volume of food eaten by each species at each of four collection times over 24 h was analysed using analysis of covariance (ANCOVA), with fish length as the covariate. Daily ration was estimated using a gastric evacuation model, incorporating mean stomach volumes at four subdaily intervals and independent evacuation rates for slower (bivalves) and faster digested prey (amphipods and polychaetes). Winter flounder, American plaice, and ocean pout were daylight feeders with American plaice feeding more heavily later in the day. Winter flounder had the highest consumption rate (1.77% body weight/day) followed by ocean pout (1.68%) and American plaice (1.28%). Estimates of daily and subdaily food consumption were compared with corresponding estimates based on prey-specific state of digestion indices. This study indicates that estimating total and individual prey consumption at subdaily intervals provides a useful tool in determining feeding chronology and draws attention to potential biases encountered when more traditional analyses are used.

Stock Structure of Scotian Shelf Flatfish as Inferred from Ichthyoplankton Survey Data and the Geographic Distribution of Mature Females

1988 ◽  
Vol 45 (10) ◽  
pp. 1674-1685 ◽  
Author(s):  
J. D. Neilson ◽  
E. M. DeBlois ◽  
P. C. F. Hurley
Keyword(s):  
Stock Assessment ◽  
Stock Structure ◽  
Stock Identification ◽  
Scotian Shelf ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Valuable Adjunct ◽  
Commercially Important ◽  
Eggs And Larvae ◽  
Sexually Mature

Data on egg distributions and timing of appearance of maximum egg densities were examined to determine the stock structure of three commercially important flatfish occurring on the Scotian Shelf: American plaice (Hippoglossoides platessoides), yellowtail flounder (Limanda ferruginea), and witch flounder (Glyptocephalus cynoglossus). Distributions of sexually mature females obtained from research vessel surveys were used to further support inferences concerning spawning location. Using such information, more than one stock of both American plaice and yellowtail flounder appear to occur on the Scotian Shelf, but no conclusions could be drawn concerning witch flounder. In the case of American plaice and yellowtail flounder, the existing means of geographic aggregation of data for stock assessment purposes do not appear to adequately represent stock structure. Little or no advection of eggs and larvae appears to occur on the Scotian Shelf, supporting the hypothesis that current-driven retention areas promote stock discreteness in that region. It was concluded that ichthyoplankton surveys can be a valuable adjunct to more traditional means of stock identification.

The incidence of Glugea stephani (Protozoa: Microsporida) in winter flounder, Pseudopleuronectes americanus, from the New York – New Jersey Lower Bay Complex and factors influencing it

1991 ◽  
Vol 69 (2) ◽  
pp. 317-321 ◽  
Author(s):  
Ann Cali ◽  
Peter M. Takvorian
Keyword(s):  
New York ◽  
New Jersey ◽  
Water Temperature ◽  
Environmental Changes ◽  
Winter Flounder ◽  
Fish Length ◽  
Pseudopleuronectes Americanus ◽  
Spawning Behaviour ◽  
Seasonal Basis ◽  
Host Parasite

The microsporidium Glugea stephani is endemic in winter flounder from the New york – New Jersey area. The prevalence of infection fluctuates with water temperature on a seasonal basis, increasing in summer and decreasing in winter. From March 1981 through December 1983, 32 monthly collections were conducted. During this period 4002 winter flounder were caught and examined, 301 (7.5%) of which were infected. Data collected during the study indicated that although several factors may influence the host–parasite interaction, only water temperature changes could be statistically correlated with G. stephani infection in this winter flounder population. In an effort to determine what factors other than temperature affect prevalence of infection, fish length, sex, diet, and spawning behaviour were examined. Although these factors do not, at first, appear to influence infectivity, stress imposed on the host by physiological and environmental changes may be significant. Our results are compared with those from G. stephani in its type host, the European flounder Platichthys flesus.

Helminth parasites of the alimentary tract of the hakes (Merluccius, Urophycis, Phycis: Teleostei) of the Scotian Shelf

1987 ◽  
Vol 65 (2) ◽  
pp. 304-311 ◽  
Author(s):  
J. S. Scott
Keyword(s):  
Alimentary Tract ◽  
Parasite Species ◽  
Gulf Of Maine ◽  
Parasite Prevalence ◽  
Fish Length ◽  
Helminth Parasites ◽  
Scotian Shelf ◽  
High Prevalence ◽  
Merluccius Bilinearis ◽  
Separate Population

Alimentary tracts of the five common hakes of the Scotian shelf (Urophycis chuss, Urophycis tenuis, Phycis chesteri, Merluccius bilinearis, Merluccius albida) were examined for helminth parasites. A total of 29 species was found: 17 Digenea, 4 Cestoda, 6 Nematoda, 2 Acanthocephala. The greatest numbers of species were found in the closely associated U. tenuis (25) and U. chuss (19). Phycis chesteri hosted a moderate number (14) but included 3 digeneans that are typical of deep water (Anomalotrema koiae, Lethadena profunda, Paraccacladium jamiesoni) not found in the other hakes. The merlucciids were characterized by low numbers of parasite species, particularly of digeneans, but showed high prevalence of the host-specific cestode Clestobothrium crassiceps. The effects of geographic distribution, fish length, and depth of capture on parasite prevalence were examined for those parasites that were adequately represented. There was little difference in geographical distribution except in the case of C. crassiceps, in which distribution suggested a separate population of M. bilinearis on the Scotian Shelf from that of the Gulf of Maine. Fish length and depth of capture had little effect on parasite prevalence.

Helminth parasites of the alimentary tract of Atlantic halibut (Hippoglossus hippoglossus L.) and Greenland halibut (Reinhardtius hippoglossoides (Walbaum)) on the Scotian Shelf

1989 ◽  
Vol 67 (6) ◽  
pp. 1476-1481 ◽  
Author(s):  
James S. Scott ◽  
Shelley A. Bray
Keyword(s):  
Parasite Prevalence ◽  
Fish Length ◽  
Atlantic Halibut ◽  
Helminth Parasites ◽  
Intermediate Hosts ◽  
Scotian Shelf ◽  
Greenland Halibut ◽  
Hippoglossus Hippoglossus ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
Reinhardtius Hippoglossoides

Examination of the alimentary tracts of 272 Atlantic halibut (Hippoglossus hippoglossus (L.)) and 71 Greenland halibut (Reinhardtius hippoglossoides (Walbaum)) from the Scotian Shelf yielded a total of 25 helminth parasite species, 23 from H. hippoglossus (16 Digenea, 3 Cestoda, 2 Acanthocephala, 2 Nematoda) and 16 from R. hippoglossoides (11 Digenea, 3 Cestoda, 1 Acanthocephala, 1 Nematoda). Parasite prevalence and intensity were low (< 50% and < 10%, respectively) in both hosts, except for Derogenes varicus and Steganoderma formosum in H. hippoglossus and anisakid nematodes in R. hippoglossoides. Consideration of change in parasite prevalence and mean intensity in relation to fish length and diet suggests fish prey as transport hosts for D. varicus in larger halibuts, and crustaceans as the intermediate hosts for S. formosum before transmission to its principal host, H. hippoglossus. Geographical change in parasite prevalence and intensity was in the form of southwest to northeast clines along the Shelf, probably related to environmental factors. There was no evidence for stock differentiation in either of the hosts based on parasite fauna.

Feeding behavior of newly settled winter flounder (Pseudopleuronectes americanus) on calanoid copepods

2001 ◽  
Vol 257 (1) ◽  
pp. 37-51 ◽  
Author(s):  
Patricia A Shaheen ◽  
Linda L Stehlik ◽  
Carol J Meise ◽  
Allan W Stoner ◽  
John P Manderson ◽  
...  
Keyword(s):  
Feeding Behavior ◽  
Winter Flounder ◽  
Calanoid Copepods ◽  
Pseudopleuronectes Americanus

Age Composition and Growth of Yellowtail Flounder (Limanda ferruginea) from the Grand Bank

1974 ◽  
Vol 31 (11) ◽  
pp. 1800-1802 ◽  
Author(s):  
T. K. Pitt
Keyword(s):  
New England ◽  
Growth Curves ◽  
Scotian Shelf ◽  
Age Composition ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Similar Growth

The commercial yellowtail flounder (Limanda ferruginea) fishery on the Grand Bank is comprised of fish age 4–12 with the main contribution from 6–8-yr-olds. Comparison of Grand Bank yellowtail with those reported for the Scotian Shelf indicates similar growth curves. The New England stocks are significantly larger at comparable age probably because of higher water temperatures.

scholarly journals Prey quality impact on the feeding behavior and lipid composition of winter flounder ( Pseudopleuronectes americanus ) larvae

2018 ◽  
Vol 3 (4) ◽  
pp. 145-155 ◽  
Author(s):  
Maria Angelica Martinez-Silva ◽  
Céline Audet ◽  
Gesche Winkler ◽  
Réjean Tremblay
Keyword(s):  
Feeding Behavior ◽  
Lipid Composition ◽  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Prey Quality
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