THE METAZOAN PARASITES OF THE HETEROSOMATA OF THE GULF OF ST. LAWRENCE: IV. CESTODA

1958 ◽  
Vol 36 (3) ◽  
pp. 429-434 ◽  
Author(s):  
Keith Ronald
Keyword(s):  
Pseudopleuronectes Americanus ◽  
Metazoan Parasites ◽  
Hippoglossus Hippoglossus ◽  
Limanda Ferruginea ◽  
Hippoglossoides Platessoides ◽  
Clestobothrium Crassiceps

Diplocotyle olrikii, Clestobothrium crassiceps, Bothriocephalus scorpii, and B. claviceps; Scolex pleuronectis, Phyllobothrium sp. (larva), and a tetraphillidean plerocercoid (Cestoda) were identified in a study of 560 specimens of Heterosomata (Hippoglossoides platessoides, Hippoglossus hippoglossus, Limanda ferruginea, Liopsetta putnami, Pseudopleuronectes americanus, and Scophthalmus aquosus) from the Gulf of St. Lawrence area. The distribution of the hosts is indicated.

THE METAZOAN PARASITES OF THE HETEROSOMATA OF THE GULF OF ST. LAWRENCE: VI. DIGENEA

1960 ◽  
Vol 38 (5) ◽  
pp. 923-937 ◽  
Author(s):  
Keith Ronald
Keyword(s):  
Pseudopleuronectes Americanus ◽  
Metazoan Parasites ◽  
Hippoglossus Hippoglossus ◽  
Limanda Ferruginea ◽  
Host Distribution ◽  
Hippoglossoides Platessoides

Aporocotyle simplex, Brachyphallus crenatus, Cryptocotyle lingua, Derogenes varicus, Genolinea laticauda, Gonocerca crassa, Hemiuris appendiculatus, H. communis, H. levinseni, Hemiuris sp., Lepidapedon rachion, Otodistomum veliporum, Peracreadium commune, Plagioporus varia, Podocotyle atomon, P. olssoni, Prosorhynchus squamatus, Steganoderma (Steganoderma) formosum, Stenakron vetustum, Stephanostomum baccatum, Steringophorus furciger, Steringotrema cluthense, and S. pagelli were identified in a study of 560 specimens of Heterosomata (Hippoglossoides platessoides, Hippoglossus hippoglossus, Limanda ferruginea, Liopsetta putnami, Pseudopleuronectes americanus, and Scophthalmus aquosus) from the Gulf of St. Lawrence area. Host distribution is indicated, together with parasitic incidence.

THE METAZOAN PARASITES OF THE HETEROSOMATA OF THE GULF OF ST. LAWRENCE: I. ECHINORHYNCHUS LAURENTIANUS SP. NOV. (ACANTHOCEPHALA: ECHINORHYNCHIDAE)

1957 ◽  
Vol 35 (3) ◽  
pp. 437-439 ◽  
Author(s):  
Keith Ronald
Keyword(s):  
Pseudopleuronectes Americanus ◽  
Metazoan Parasites ◽  
Hippoglossus Hippoglossus ◽  
Hippoglossoides Platessoides

Echinorhynchus laurentianus sp. nov. (Acanthocephala: Echinorhynchidae) is described from Hippoglossoides platessoides, Hippoglossus hippoglossus, Pseudopleuronectes americanus, and Scophthalmus aquosus from the Gulf of St. Lawrence.

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.

Larval Flatfish Distributions and Drift on the Southern Grand Bank

1992 ◽  
Vol 49 (3) ◽  
pp. 467-483 ◽  
Author(s):  
Kenneth T. Frank ◽  
John W. Loder ◽  
James E. Carscadden ◽  
William C Leggett ◽  
Christopher T. Taggart
Keyword(s):  
Growth Rate ◽  
Thermocline Depth ◽  
Length Frequency ◽  
Frequency Distributions ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Larval Drift ◽  
Vertical Distributions ◽  
Hippoglossoides Platessoides ◽  
Rule Out

Ichthyoplankton and hydrographic surveys of the southern Grand Bank in September of 1986, 1987, and 1988 revealed substantial correspondence between the areal distributions of larvae of three flatfish species and temperature below the thermocline. Depth-averaged densities of American plaice (Hippoglossoides platessoides) were negatively correlated with temperature whereas yellowtail flounder (Limanda ferruginea) and witch flounder (Glyptocephalus cynoghssus) densities were positively correlated with temperature. In spite of large interannual differences in abundance, the larval distributions showed similar structure from year to year. Using estimates of larval age inferred from length frequency distributions and literature values for growth rate, in conjunction with moored current measurements, estimates of spawning times and locations were obtained for each species. These estimates were compared with historical information on the distribution of prespawning fish for each species to examine the hypothesis of passive larval drift. The results indicate that in most, but not all cases, the larval distributions and currents are consistent with passive larval drift for particular growth rates and vertical distributions. However, the observations are not adequate to rule out alternative mechanisms involving behaviour.

Oocyte Maturation and Ovulation Induced in Hypophysectomized Winter Flounder (Pseudopleuronectes americanus) by Preparations from Pituitary Glands of American Plaice (Hippoglossoides platessoides)

1977 ◽  
Vol 34 (11) ◽  
pp. 2142-2150 ◽  
Author(s):  
C. M. Campbell ◽  
D. R. Idler
Keyword(s):  
Key Words ◽  
Oocyte Maturation ◽  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Con A ◽  
Pituitary Glands ◽  
Hippoglossoides Platessoides

Hypophysectomized winter flounder (Pseudopleuronectes americanus) did not undergo spontaneous oocyte maturation, but the glycoprotein fraction of extracts of American plaice (Hippoglossoides platessoides) pituitaries induced maturation and ovulation. The nonglycoprotein fractions, previously shown to contain a vitellogenic factor, were less efficient than the glycoprotein fractions in the induction of maturation and ovulation. The activity of the nonglycoprotein fraction was further reduced by rechromatography on Con-A Sepharose, suggesting that its action on oocyte maturation and ovulation was due to contamination by the glycoprotein gonadotropin. Key words: hypophysectomy, gonadotropin, oocyte, maturation, ovulation, vitellogenesis, flounder, plaice, Pseudopleuronectes, Hippoglossoides

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.

THE METAZOAN PARASITES OF THE HETEROSOMATA OF THE GULF OF ST. LAWRENCE: V. MONOGENEA

1960 ◽  
Vol 38 (2) ◽  
pp. 243-247
Author(s):  
Keith Ronald
Keyword(s):  
Host Specificity ◽  
Atlantic Halibut ◽  
Metazoan Parasites ◽  
Hippoglossus Hippoglossus

Udonella caligorum, Entobdella hippoglossi, and E. curvunca were identified in a study of 43 Atlantic halibut, Hippoglossus hippoglossus. The incidence, distribution, and host specificity of the halibut's monogenetic parasites are discussed.

scholarly journals Marine fish haematozoa from Newfoundland waters

1972 ◽  
Vol 50 (5) ◽  
pp. 543-554 ◽  
Author(s):  
Bernard K. F. So
Keyword(s):  
Marine Fish ◽  
Gadus Morhua ◽  
Melanogrammus Aeglefinus ◽  
Potential Vector ◽  
Type Host ◽  
Limanda Ferruginea ◽  
New Hosts ◽  
Myoxocephalus Scorpius ◽  
Raja Radiata ◽  
Hippoglossoides Platessoides

Of 797 fish of 28 species, 159 of 12 species yielded blood protozoa. Trypanosoma rajae is recorded from Raja radiata. Undetermined trypanosomes are reported from Glyptocephalus cynoglossus and Gadus morhua, respectively. Haemogregarina myoxocephali is listed from the type host, Myoxocephalus octodecemspinosus. The occurrence of haemogregarine sporozoites (perhaps of this species) in the gut of a piscicolid leech (Malmiana nuda) from Myoxocephalus scorpius represents the first discovery of a potential vector of any fish haemogregarine. New hosts are listed for Haemogregarina delagei and H. platessae. A babesioid Haemohormidium terraenovae n. sp. is described from six hosts: Ammodytes americanus, Urophycis tenuis, Melanogrammus aeglefinus, Limanda ferruginea, Glyptocephalus cynoglossus, and Hippoglossoides platessoides; and another, Haemohormidium beckeri n. s p., from Myoxocephalus octodecemspinosus.

On a trypanosome from the Atlantic cod, Gadus morhua L.

1972 ◽  
Vol 50 (7) ◽  
pp. 1051-1054 ◽  
Author(s):  
R. A. Khan
Keyword(s):  
New Zealand ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Infected Fish ◽  
Tautogolabrus Adspersus ◽  
Pseudopleuronectes Americanus ◽  
Blood Samples ◽  
Limanda Ferruginea

Trypanosomes were found in 145 (24%) of 610 Atlantic cod, Gadus morhua L., following examination of centrifuged blood samples. The smallest infected fish measured 26 cm. Generally, parasitemias were higher in cod 26–35 cm long than in larger fish, but were more prevalent among fish 56–70 cm. The parasite could not be transmitted experimentally to Pseudopleuronectes americanus, Myoxocephalus octodecemspinosus, M. scorpius, Tautogolabrus adspersus, or Limanda ferruginea, but uninfected cod were susceptible. The trypanosome appears distinct from Trypanosoma coelorhynchi Laird, 1951 from gadiform fishes in New Zealand waters. It is tentatively identified as T. murmanensis Nikitin, 1927 reported from the same host, G. morhua, captured at Murmansk, U.S.S.R.

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