Canadian Fish Research Articles

Canadian Special Publication of Fisheries and Aquatic Sciences, Volume 101, Guide to the Parasites of Fishes of Canada. Part II: Crustacea

Canadian Special Publication of Fisheries and Aquatic Sciences, Volume 101, Guide to the Parasites of Fishes of Canada. Part II: Crustacea

Guide to the Parasites of Fishes of Canada, Part II: Crustacea

Guide to the Parasites of Fishes of Canada, Part II: Crustacea

Evaluation of Three Techniques to Age Arctic Char from Alaskan and Canadian Waters

Abstract Ages of fish from three stocks of North American Arctic char Salvelinus alpinus were estimated by examination of the external surface of otoliths, burnt otolith sections, and sectioned fin rays. Anal and pectoral fins showed the best definition of opaque and translucent zones and produced similar ages. However, age estimates for both fins varied extensively from and were generally lower than ages estimated from burnt otolith sections. Age estimates from both otolith techniques were similar up to about age 8, after which burnt otolith sections yielded greater ages. Maximum ages of Alaskan fish were lower than ages of Canadian stocks from Ekalluk River and Nauyuk Lake (13, 19, and 21 years, respectively). Estimates of von Bertalanffy growth parameters from the two otolith aging techniques were different for the three stocks. Maximum ages estimated for the Alaskan and Canadian fish were similar to those presented in past studies and appear related to what has been designated the western (Alaskan) an...

Canadian government financial intervention in a marine fishery: The case of newfoundland, 1972/73–1980/81

Abstract Trade in fish products between Canada and the United States has been the subject of extensive legal activity in the latter country. United States fishing interests have repeatedly attempted to utilize provisions in U.S. law and in the General Agreement on Tariffs and Trade (GATT) to have countervailing duties imposed on imports of Canadian fish products, the prices of which are alleged to be artificially depressed by Canadian government financial support of the industry. This paper summarizes the state of U.S. and international law on countervailing duties, and surveys recent legal activity on the matter. It then presents hitherto uncollected evidence on government financial support of a major Canadian fishery, the Newfoundland groundfishery. It is found that the total value of expenditures was equal to 31 percent of the value of total fish products in 1980/81. However, subsidies as defined by the U.S. International Trade Administration, in accordance with U.S. law and the GATT, amounted to only 4.5 percent of the value of total fish products in that year.

Identification of arsenobetaine and arsenocholine in Canadian fish and shellfish by high-performance liquid chromatography with atomic absorption detection and confirmation by fast atom bombardment mass spectrometry

Identification of arsenobetaine and arsenocholine in Canadian fish and shellfish by high-performance liquid chromatography with atomic absorption detection and confirmation by fast atom bombardment mass spectrometry

Guide to the Parasites of Fishes of Canada. Part 1: General Introduction; Monogenea and Turbellaria

Guide to the Parasites of Fishes of Canada. Part 1: General Introduction; Monogenea and Turbellaria

What’s Wrong With Canadian Fish?

This paper considers the current dilemma of the eastern Canadian fisheries in the light of their historical development problems as reflected in Gaspé and Newfoundland and in contrast to the history of the Icelandic fishery. The paradox of being the nearest country to a prolific resource which is nevertheless most profitably exploited by other nations is highlighted, and Canadian ‘failure’ is argued to be structural and perceptual rather than intrinsic to the resource itself.

Harvesting Canadian Fish and Rents: A Partial Review of the Report of the Commission on Canadian Pacific Fisheries Policy

The Canadian Pacific fisheries currently suffer from excess harvesting capacity. A recent Royal Commission has recommended a joint scheme of royalties on the catch and a novel license auction plan to alleviate the problem. This paper investigates the impact of these two policies. First, the total royalty revenue is measured and then the royalty incidence across fishermen, processors, and consumers is estimated. Next, we analyze the license auction scheme to calculate the costs of purchasing the licenses to the fishermen and the net proceeds to the government after the retirement of one-half the fleet under alternative possible selling strategies of fishermen. We conclude that the royalty scheme would finance the retirement of the fleet in 13 years and that the incidence of the royalty would vary greatly across species/gear type. The license auction scheme, in contrast, is a potent policy measure which under several scenarios could fully fund the buy-back program and contribute significantly to public revenue.

Need for Development of Epidemiology for Chemically Induced Diseases in Fish in Canada

There are few case histories in Canada in which chronic low level exposure to pollutants has been demonstrated to have caused deleterious effects on fish. I challenge the adequacy of approaching aquatic toxicology mainly by laboratory experimentation. I argue that the discipline should start from observations of anomalous biological phenomena in the environment.

Canadian Fish Supplies to the German Market

Canadian Fish Supplies to the German Market

Synopsis of the Parasites of Fishes of Canada

Synopsis of the Parasites of Fishes of Canada

New and Rare Records of Canadian Fishes and the Influence of Hydrography on Resident and Nonresident Scotian Shelf Ichthyofauna

A recently initiated ichthyoplankton survey of the Scotian Shelf has discovered large numbers of subtropical/tropical expatriated fishes, mostly larvae, and at least two previously unrecognized populations. Thirty-three species in 25 primarily subtropical families (Carcharhinidae, Engraulidae, Synodontidae, Chlorophthalmidae, Ogcocephalidae, Antennariidae, Carapidae, Ophidiidae, Exocoetidae, Syngnathidae, Scorpaenidae, Triglidae, Dactylopteridae, Serranidae, Apogonidae, Branchiostegidae, Rachycentridae, Sciaenidae, Labridae, Scaridae, Callionymidae, Gobiidae, Bothidae, Cynoglossidae, and Ostraciontidae), seven species in four deepwater families (Gonostomatidae, Sternoptychidae, Myctophidae, and Moridae) and two gadoids are reported as new or rare records from the Canadian Atlantic. The frequency and quantity of subtropical expatriates raise the question of their ultimate fate. The existence of eastern Atlantic populations of some of these raises the possibility of transatlantic dispersal. Juvenile or adult specimens of most of the expatriated forms have not been found on the Scotian Shelf but the complex hydrography on the shelf may allow temporary habitation especially in summer. Two species, red hake and Gulf Stream flounder, appear to have discrete, self-sustaining populations on the Scotian Shelf. Both species appear to represent northernmost populations which may be living near their lower thermal limit. Discrepancies between the literature on red hake and data reported herein are unresolved and require long-term observations.Key words: Scotian Shelf, ichthyoplankton, hydrography, zoogeography, western North Atlantic

A Guide to the Freshwater Sport Fishes of Canada

A Guide to the Freshwater Sport Fishes of Canada

Some new Eimeria (Protozoa, Coccidia) from freshwater fishes in Ontario, Canada.

Twelve new species of Eimeria (Protozoa, Coccidia) have been described and figured from freshwater fishes in Ontario, Canada. They are Eimeria osmeri sp. nov., E. glenorensis sp. nov., E. freemani sp. nov., E. degiustii sp. nov., E. moronei sp. nov., E. hybognathi sp. nov., E. iroquoina sp. nov., E. ictaluri sp. nov., E. laureleus sp. nov., E. ojibwana sp. nov., E. haneki sp. nov., and E. tedlai sp. nov. This is the first published record on Coccidia in freshwater fishes in Canada.

Freshwater Fishes of Canada, by W.B. Scott and E.J. Crossman

Freshwater Fishes of Canada, by W.B. Scott and E.J. Crossman

Canadian Fish

Canadian Fish

Mercury in Canadian Fish

Mercury in Canadian Fish

Fishes of Canada

Freshwater Fishes of Northwestern Canada and Alaska. By J. D. McPhail and C. C. Lindsey. (Fisheries Research Board of Canada Bulletin No. 173.) Pp. 381. (Queen's: Ottawa, 1970.) $8.50.

Changes in the corpuscle of Stannius during the spawning journey of Atlantic salmon ( Salmo salar)

In an effort to clarify the function of the corpuscle of Stannius in Atlantic salmon ( Salmo salar), histological studies were made of specimens from Canadian fish taken at various stages in the spawning journey. The general architecture and cell types of the corpuscle changed in several ways; these were more closely related to time in fresh water than to gonadal development. An anatomical unit composed of ganglion cells, nerves, and thick-walled blood vessels was consistently noted between the corpuscle and adjacent renal tissue. The relation of these observations to the overall function of the teleostean kidney with its several mechanisms for homeostatic control of electrolytes and steroid activity is briefly discussed.

Rare or Endangered Canadian Fishes

Rare or Endangered Canadian Fishes