The Embryology of the Swim Bladder in the Common Sucker Catostomus commersoni (Lacepede)

1959 ◽  
Vol 61 (1) ◽  
pp. 245
Author(s):  
Edward M. Nelson
Keyword(s):  
Swim Bladder ◽  
Catostomus Commersoni ◽  
The Common

Philometroides huronensis n.sp. (Nematoda: Dracunculoidea) of the common white sucker (Catostomus commersoni) from Lake Huron, Ontario

1976 ◽  
Vol 54 (3) ◽  
pp. 369-376 ◽  
Author(s):  
Leslie S. Uhazy
Keyword(s):  
The Body ◽  
Lake Huron ◽  
Swim Bladder ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Size And Shape ◽  
Cuticular Ornamentation ◽  
The Common ◽  
Gravid Females ◽  
A New Species

A new species of nematode, Philometroides huronensis n.sp., is described from the fins and peritoneum around the swim bladder of the common white sucker (Catostomus commersoni). The gravid females and the males of this species are readily distinguishable from those of other members of the genus by the body size, cuticular ornamentation, caudal ventrolateral hypodermal extensions, size and shape of first-stage larva, length of spicules, size and shape of gubernaculum, and location in the host. Measurements of mature and subgravid females are presented.

Some remarks on the occurrence and development of philometrid nematodes infecting the white sucker, Catostomus commersoni Lacépède (Pisces: Catostomidae), in Ontario

1982 ◽  
Vol 60 (3) ◽  
pp. 443-451
Author(s):  
K. Molnar ◽  
G. L. Chan ◽  
C. H. Fernando
Keyword(s):  
Life Cycle ◽  
Developmental Stages ◽  
Abdominal Cavity ◽  
Swim Bladder ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Laurel Creek

During a study on the parasitofauna of white sucker (Catostomus commersoni) in Laurel Creek, Ontario, three philometrid nematodes were found. Gravid and subgravid females completing the life cycle occurred very infrequently (Philometroides huronensis: 4.3%, Philometroides nodulosa: 1.6%, Philometra kobuleji: 1.1%). In comparison, males and retarded females infected the eyeball and the peritoneum around the swim bladder very often (43.1 and 31.6% in total, respectively). Less frequently, developmental stages were found in the abdominal cavity. Specimens found in the eyeball were identified as belonging to P. nodulosa, while the swim bladder forms could belong to P. huronensis or to P. kobuleji. The eyeball and the peritoneum around the swim bladder are regarded as refuges for retarded forms, where they can survive for more than a year. No evidence was found of a direct cause of retardation.

Three new species of Octosporella (Protozoa: Coccidia) from cyprinid fish in Algonquin Park, Ontario

1985 ◽  
Vol 63 (8) ◽  
pp. 1859-1862 ◽  
Author(s):  
Lianxiang Li ◽  
Sherwin S. Desser
Keyword(s):  
New Species ◽  
Present Report ◽  
Cyprinid Fish ◽  
Swim Bladder ◽  
Protozoan Parasites ◽  
Golden Shiner ◽  
Coccidian Parasites ◽  
The Common ◽  
Three New Species ◽  
First Time

Among the protozoan parasites observed in cyprinid fish from Lake Sasajewun and Lake Opeongo, Algonquin Park, Ontario, were coccidian parasites with oocysts containing eight sporocysts, each of which housed two sporozoites. Three new species of Octosporella Ray and Raghavachari, 1942 are described: Octosporella notropis sp. n. from the intestine, spleen, and swim bladder of the common shiner, Notropis cornutus (Mitchill), and Octosporella opeongoensis sp. n. and Octosporella sasajewunensis sp. n. from the swim bladder of the golden shiner, Notemigonus crysoleucas (Mitchill). The present report represents the first time parasites of this genus have been recorded from fish.

Development of Philometroides huronensis (Nematoda: Dracunculoidea) in the intermediate and definitive hosts

1977 ◽  
Vol 55 (2) ◽  
pp. 265-273 ◽  
Author(s):  
Leslie S. Uhazy
Keyword(s):  
Swim Bladder ◽  
Catostomus Commersoni ◽  
Larval Stages ◽  
Third Stage

Development of the larval stages of Philometroides huronensis Uhazy, 1976 took place in the haemocoel of the copepods Cyclops bicuspidatus thomasi and Cyclops vernalis. In C. bicuspidatus thomasi held at 10 °C, the first moult occurred 14 to 18 days and the second 30 days after exposure to first-stage larvae. In C. vernalis kept at 20 to 23 °C, moults from the first to second and second to third stage occurred at 6 to 9 and 14 to 20 days, respectively, after infection. Larval stages are described.Infective larvae were transmitted to laboratory-reared white suckers (Catostomus commersoni (Lacépède)). Fish were kept under controlled temperatures and photoperiods. Thirteen of 41 fish were infected with various stages of the parasite (i.e. third-stage larvae, males, uninseminated and inseminated females). All stages were recovered from the peritoneum around the swim bladder. Few male and inseminated female worms were recovered and development of subgravid and gravid stages was not investigated.

Catalogue reduction techniques

1978 ◽  
Vol 48 ◽  
pp. 389-390 ◽  
Author(s):  
Chr. de Vegt
Keyword(s):  
Adjustment Process ◽  
Proper Motions ◽  
Measuring Process ◽  
Aerial Photogrammetry ◽  
Reduction Techniques ◽  
Observational Technique ◽  
The Common ◽  
Astrometric Data

AbstractReduction techniques as applied to astrometric data material tend to split up traditionally into at least two different classes according to the observational technique used, namely transit circle observations and photographic observations. Although it is not realized fully in practice at present, the application of a blockadjustment technique for all kind of catalogue reductions is suggested. The term blockadjustment shall denote in this context the common adjustment of the principal unknowns which are the positions, proper motions and certain reduction parameters modelling the systematic properties of the observational process. Especially for old epoch catalogue data we frequently meet the situation that no independent detailed information on the telescope properties and other instrumental parameters, describing for example the measuring process, is available from special calibration observations or measurements; therefore the adjustment process should be highly self-calibrating, that means: all necessary information has to be extracted from the catalogue data themselves. Successful applications of this concept have been made already in the field of aerial photogrammetry.

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