Corynosoma wegeneri (Acanthocephala: Polymorphida) and Pseudoterranova decipiens (Nematoda: Ascaridoidea) Larvae in Scotian Shelf Groundfish

1992 ◽  
Vol 49 (10) ◽  
pp. 2062-2069 ◽  
Author(s):  
David J. Marcogliese ◽  
Gary McClelland
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Host Record ◽  
Melanogrammus Aeglefinus ◽  
Scotian Shelf ◽  
New Host ◽  
New Host Record ◽  
Pseudoterranova Decipiens ◽  
Sea Raven ◽  
Longhorn Sculpin

We examined larvae of the seal parasites Corynosoma wegeneri and Pseudoterranova decipiens in various fish species collected from Western and Sable Island banks between February 1989 and October 1990. Atlantic cod (Gadus morhua), haddock (Melanogrammus aeglefinus), American plaice (Hippoglossoides platessoides), yellowtail flounder (Pleuronectes ferrugineus), windowpane (Scophthalmus aquosus), longhorn sculpin (Myoxocephalus octodecemspinosus), and sea raven (Hemitripterus americanus) were infected by both parasites, longhorn sculpin being a new host record for C. wegeneri. Only C. wegeneri occurred in winter flounder (Pleuronectes americanus), and neither parasite was found in northern sand lance (Ammodytes dubius) or capelin (Mallotus villosus). The two parasites were most numerous in sea raven and longhorn sculpin. Corynosoma wegeneri was more prevalent in fish sampled in 1989–90 than in previous surveys of Atlantic cod and haddock from the Scotian Shelf. Pseudoterranova decipiens and C. wegeneri occurred throughout the sampling area, but small fishes in the vicinity of Sable Island had the heaviest sealworm infections, and both parasites in longhorn sculpin declined with distance from Sable Island. Increases of C. wegeneri in groundfish, like recent increased levels of P. decipiens infection on the Scotian Shelf, can be attributed to the dramatic growth of the grey seal (Halichoerus grypus) population on Sable Island.

scholarly journals Distribution and abundance of sealworm (Pseudoterranova decipiens) and other anisakid nematodes in fish and seals in the Gulf of St. Lawrence: potential importance of climatic conditions

2001 ◽  
Vol 3 ◽  
pp. 113 ◽  
Author(s):  
David J Marcogliese
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Climatic Conditions ◽  
Pseudoterranova Decipiens ◽  
Nematode Abundance ◽  
Contracaecum Osculatum ◽  
Myoxocephalus Scorpius ◽  
Longhorn Sculpin ◽  
Anisakid Nematodes ◽  
Seal Diet

Prevalence and abundance of sealworm (Pseudoterranova decipiens) and other anisakid nematodes were determined in a variety of fishes from the Gulf of St. Lawrence in 1990 and 1992. Sealworm abundance and prevalence were also determined in three species of seals in the Gulf between 1988 and 1992. Atlantic cod (Gadus morhua) and shorthorn (Myoxocephalus scorpius) and longhorn sculpin (M. octodecemspinosus) were the fishes most heavily infected with sealworm. Grey seals(Halichoerus grypus) proved to be the most important definitive hosts for sealworm in the Gulf. Abundance of sealworm increased, whereas that of Anisakis simplex and contracaecine nematodes decreased, from north to south in the Gulf. Abundance of sealworm increased compared to earlier surveys in most areas of the Gulf, but decreased in both cod and grey seals during the course of this study. In contrast, abundance of Contracaecum osculatum and Phocascaris spp. in grey seals and cod continued to increase during the study period. Observed increases of nematodes are attributed to growing populations of grey seals (for sealworm) and harp seals (for Contracaecinea). Levels of A. simplex remained relatively constant between 1988 and 1992 in both grey seals and cod. There is no evidence suggesting that observed patterns in nematode abundance were due to changes in grey seal diet. Nor was there any evidence of competition between P. decipiens and C. osculatum in grey seals affecting either sealworm abundance or fecundity. The trends detected herein are attributed to climatic events in the Gulf of St. Lawrence, where water temperatures in the cold intermediate layer consistently decreased between 1986 and 1994. It is suggested that low temperatures inhibited development and hatching of sealworm eggs, but not those of C. osculatum.

Serial Passage of Larval Pseudoterranova decipiens (Nematoda:Ascaridoidea) in Fish

1990 ◽  
Vol 47 (4) ◽  
pp. 693-695 ◽  
Author(s):  
M. D. B. Burt ◽  
J. D. Campbell ◽  
C. G. Likely ◽  
J. W. Smith
Keyword(s):  
Brook Trout ◽  
Gadus Morhua ◽  
Sea Water ◽  
Atlantic Cod ◽  
Serial Passage ◽  
Success Rates ◽  
First Passage ◽  
Pseudoterranova Decipiens ◽  
Sea Raven ◽  
Hemitripterus Americanus

In one experiment, 24 brook trout (Salvelinus fontinalis) in fresh water at 11 ± 1 °C were each orally infected by intubation with two third-stage larvae of "sealworm" (Pseudoterranova decipiens) harvested from the flesh of sea raven (Hemitripterus americanus) and small Atlantic cod (Gadus morhua). In a second experiment, 27 cod in sea water at 0 °C were each force fed, under anaesthesia, four P. decipiens larvae held in a capelin "purse"; these larvae were harvested from large, commercial size cod. Sequential reinvasion by the same P. decipiens larvae was achieved in both of the serial passage experiments. In brook trout, larvae sequentially reinvaded a maximum of two fish, with larvae of cod origin being the more successful at first passage (62.5%) than those of sea raven origin (31.3 and 37.5%). In cod, larvae also achieved sequential reinvasion of a maximum of two fish; the relatively lower success rates of 22.2% (first passage) and 9.1% (second passage) probably reflect the low temperature (0 °C) at which the experiment was conducted.

Swimming Endurance of Some Northwest Atlantic Fishes

1966 ◽  
Vol 23 (3) ◽  
pp. 341-347 ◽  
Author(s):  
F. W. H. Beamish
Keyword(s):  
Swimming Speed ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Northwest Atlantic ◽  
Sea Raven ◽  
Longhorn Sculpin ◽  
Hemitripterus Americanus ◽  
Swimming Endurance

Endurance was determined in relation to swimming speed and temperature for Atlantic cod, Gadus morhua Linnaeus, redfish, Sebastes marinus (Linnaeus), winter flounder, Pseudopleuronectes americanus (Walbaum), and to swimming speed at 8 C for longhorn sculpin, Myoxocephalus octodecimspinosus (Mitchill), sea raven, Hemitripterus americanus (Gmelin), and ocean pout, Macrozoarces americanus (Block and Schneider).In an activity chamber at a swimming speed of 4 body lengths per second (BL/sec) Atlantic cod swam for about equally long periods at 5 and 8 C, and redfish and winter flounder each about equally long at 5, 8, and 11 C. The pattern was similar for higher speeds. At 14 C winter flounder swam longer at 6 BL/sec than at the lower temperatures. For swimming speeds less than 4 BL/sec all species swam longer at the higher temperatures. At 8 C, the only temperature at which all species were tested, endurance at comparable swimming speeds was greatest for winter flounder, followed by cod, redfish, longhorn sculpin, ocean pout, and sea raven.

Distribution of Early-Stage Atlantic Cod (Gadus morhua), Haddock (Melanogrammus aeglefinus), and Witch Flounder (Glyptocephalus cynoglossus) Eggs on the Scotian Shelf: A Reappraisal of Evidence on the Coupling of Cod Spawning and Plankton Production

1992 ◽  
Vol 49 (2) ◽  
pp. 238-251 ◽  
Author(s):  
Keith Brander ◽  
Peter C. F. Hurley
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Early Stage ◽  
Calanus Finmarchicus ◽  
Melanogrammus Aeglefinus ◽  
Scotian Shelf ◽  
Plankton Production ◽  
Peak Abundance ◽  
Haddock Melanogrammus Aeglefinus ◽  
Timing Of Spawning

In spring, Atlantic cod (Gadus morhua) spawned progressively later from southwest to northeast along the Scotian Shelf and matched the variation in peak abundance of Calanus finmarchicus. In fall, cod spawned in some, but not all, areas where Calanus were abundant. This is consistent with the hypothesis that cod spawning is coupled to copepod production, which is a part of the "match–mismatch" hypothesis proposed by D. H. Cushing. The timing of spawning was estimated from the distributions of early- and late-stage eggs of cod, haddock (Melanogrammus aeglefinus), and witch flounder (Glyptocephalus cynoglossus) collected during Scotian Shelf Ichthyoplankton Survey (SSIP) cruises in 1979–81.

Two New Host Species for the Parasitic Fungus Ichthyophonus hoferi in the Northwest Atlantic

1972 ◽  
Vol 29 (12) ◽  
pp. 1776-1777 ◽  
Author(s):  
Jerry D. Hendricks
Keyword(s):  
Gadus Morhua ◽  
Gulf Of Maine ◽  
Atlantic Cod ◽  
Parasitic Fungus ◽  
New Host ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
New Hosts ◽  
Longhorn Sculpin ◽  
New Host Species

Microscopic examination of kidney tissues from eight Gulf of Maine fish species revealed cysts of the fungus Ichthyophonus hoferi, Plehn and Mulsow, in individuals from three species. Two of these species, the longhorn sculpin (Myoxocephalus octodecemspinosus) and the Atlantic cod (Gadus morhua), are new hosts for this parasite in Gulf of Maine waters. The other species, the yellowtail flounder (Limanda ferruginea), was previously reported as an Ichthyophonus host.

Addition to Micropeltidaceae: Micropeltis goniothalamicola sp. nov. and new record of Scolecopeltidium menglaense from Chiang Rai, Thailand

Phytotaxa ◽  
2021 ◽  
Vol 487 (1) ◽  
pp. 56-64
Author(s):  
DIANA S. MARASINGHE ◽  
SINANG HONGSANAN ◽  
SARANYAPHAT BOONMEE ◽  
NING XIE
Keyword(s):  
New Record ◽  
Sequence Data ◽  
Novel Species ◽  
Host Record ◽  
Its Sequence ◽  
New Taxon ◽  
Morphological Comparison ◽  
New Host ◽  
Mucilaginous Sheath ◽  
New Host Record

A novel species, Micropeltis goniothalamicola and a new record Scolecopeltidium menglaense were collected from Mae Fah Luang Botanical Gardens, Thailand. Our new taxon is different from other species in Micropeltis in having relatively smaller ascomata, 6–8-spored asci and 4–5-septate ascospores covering with mucilaginous sheath. Our new record, S. menglaense is the first host recorded from Jasmine grandiflorum (Oleaceae). Morphological comparison coupled with phylogenetic analysis of combined LSU and ITS sequence data provide evidence for the new species and new host record.

New Host Record and Distribution of Dicarnosis ripariensis Kerrich1 in Mexico

2021 ◽  
Vol 46 (1) ◽  
Author(s):  
J. Refugio Lomeli-Flores ◽  
Jimena Lima-Espindola ◽  
Héctor González-Hernández ◽  
Esteban Rodríguez-Leyva ◽  
Julio C. Velázquez-Gonzalez
Keyword(s):  
Host Record ◽  
New Host ◽  
New Host Record
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