No description available.

No description available.

I studied the onshore migrations of Atlantic cod (Gadus morhua) in the northern Gulf of St. Lawrence to test the predictability of the distributions and catches of a migratory predatory fish relative to physical oceanographic processes and the distributions and abundances of its prey. To survey daily fish distributions and abundances by species, hydroacoustic signal discriminant methods were developed which classified schools of cod, capelin (Mallotus villosus), and mackerel (Scomber scombrus) with 93% success. Physical oceanographic processes along the 150 km of coastline studied were characterized by Ekman-type upwellings and downwellings forced by alongshore winds at periods $>$3 d. Physical elements of this system (principally currents and temperature) were associated with cross-shore movements of cod and accounted for as much as 83% of the variance in mean trap catch. Cod and capelin formed coherent spatial distributions when capelin were congregated where sea temperatures were most favorable to cod (1 to 5$ sp circ$C) and mean capelin densities were above 100/10$ sp5$m$ sp3$. Coherences were in phase at larger scales ($>$10 km) but became increasingly out of phase at smaller scales. Cod distributions fit the predictions of an "ideal" distribution (allometric constant = 0.67) when two constraints were put on the relationship: (1) capelin densities above 100/10$ sp5$m$ sp3$, and (2) temperatures between 1 and 9$ sp circ$C.

The distribution, abundance, growth, length-weight relationships and reproductive ecology of whiting, Norway pout and poor-cod populations were studied in inshore and offshore areas around Oban from November 1974 to March 1977. Planktonic stages and mature adults were found only at offshore sites, the inshore areas being nursery grounds for all three species. Immigration occurred between June and December of the O-group when the fish were nektonic, with part of the population pelagiC and part demersal. In whiting the young fish aggregated for a short period inshore, but in other species abundance was always greater offshore. Norway pout and poor-cod remained on the nursery. grounds for between one and two years, whereas few whiting remained longer than one year. In all species shallower sampling sites were vacated more rapidly than deeper ones. The migration of fish offshore is considered in relation to growth, diet and maturation. The ecological significance and management implications of the migrations are discussed. The rate of growth in length and weight varied seasonally, being more rapid in summer and autumn in all species. Differences were found between localities in rate of growth and are thought to be due to a preference by older fish for deeper water. Only the poor-cod spawned in the study area, at Tiree Passage and on the south-west coast of Null. Spawning occurred between January and May, with a peak in April. Females matured at a mean.length of 15.6 cm in the 2-group with only a small proportion of 1-group fish maturing. In males the average age of first maturity was lower (14.0 - 14.6 cm) and a greater proportion of 1-group fish matured, which compensated for a slightly lower survival rate in older fish and equalised the sex-ratio of the spawning popUlation. The success of reproduction was highly dependent on a single year-class, since 83.3% of reproducing females belonged to the 2-group. Although ripe and spent whiting and Norway pout were caught at offshore sites no spawning fish were encountered. The possibility of a spawning migration out of the area and the locality of spawning is discussed for each species. Length-weight relationships were calculated for each species and significant differences were found between males and females in all cases. Seasonal variations in condition were studied by calculation of condition factors and by analysis of monthly length-weight relationships.

Thesis (M.Sc.)--Memorial University of Newfoundland, 2004. / Bibliography: leaves 105-123.

The presence of great quantities of cod along much of the North American eastern seaboard was a significant factor in the early settlement and economy of the ares. European fishing fleets first appeared before 1510 (Innis, 1954). [...]

No description available.

The coastal fish community of Wemindji, eastern James Bay, was studied to describe seasonal utilization of the Maquatua River estuary and the adjacent coastal waters by marine and anadromous fishes. During summer, the estuarine fishes are numerically dominated by the fourhorn sculpin (Myoxocephalus quadricornis) and the slender eelblenny (Lumpenus fabricii), and also by juvenile cisco (Coregonus artedii) and whitefish (C. clupeaformis). In coastal waters, three marine species are abundant: the shorthorn sculpin (M. scorpius), the arctic sculpin (M. scorpioides) and the Greenland cod (Gadus ogac). / Greenland cod were studied in the same period. During the summer, they principally occupied shallow coastal waters, characterized by a belt of eelgrass (Zostera marina). In winter, more cod were found in the estuary. This movement corresponds to sexual maturity; spawning occurs in April to June. Greenland cod life history variables differ from those of most arctic benthic fishes: they show rapid growth, high fecundity, low age at first maturity and high mortality.

No description available.

La recherche porte sur l’industrie des sécheries de morues de l’agglomération bordelaise (Bordeaux, Talence et Bègles) aux XIXe et XXe siècles. Elle s’intéresse également au trafic morutier du port girondin. Cette industrie nouvelle à Bordeaux, mais aussi dans d’autres ports de France, naît vers 1825-1830. A partir de 1860, les trente sécheries bordelaises détiennent un quasi-monopole du séchage en France. La création de sécheries mécaniques à vapeur dans les ports normands et bretons à partir de 1900 entraîne l’érosion du monopole bordelais. Après la Seconde Guerre mondiale, le négoce et l’industrie du séchage peinent à se moderniser tandis que, paradoxalement, Bordeaux devient un important port d’armement à la grande pêche. Vers 1968, le développement de la congélation entraîne la fermeture rapide des sécheries. Les armements bordelais restent actifs jusqu’à la veille des années 1990. Une partie de l’étude est consacrée à la sociologie des acteurs du négoce de la morue à Bordeaux : armateurs, consignataires, marchands. Une attention particulière est portée aux sécheurs ou laveurs de morues qui, en grande partie, sont originaires du Cantal. / This research concerns the industrial development of cod drying plants in Bordeaux urban area (Bordeaux, Talence and Bègles) in the 19th and 20th centuries. It also deals with the cod trade in the port. This new industry in Bordeaux, but also in other french ports, is born around 1825-1830. From 1860, thirty driers of Bordeaux area hold a virtual monopoly of the drying industry in France. The creation of steam mechanical driers in the Norman and Breton ports from 1900 leads to the erosion of Bordeaux monopoly. After the Second World War, the trade and the drying industry have difficulty getting modernized whereas, paradoxically, Bordeaux becomes an important port for cod fishing. By 1968, the development of freezing leads to the fast closing down of the drying plants. Armaments of Bordeaux remain active until 1990s. A part of this study is also dedicated to the sociology of the actors of the cod trade in Bordeaux: ship owners, consigners, merchants. A particular interest is taken in cods-driers who are mostly native of Cantal.