Untersuchungen über die Nutzfischbestände bei der Bäreninsel und vor Spitzbergen im Sommer 1977

200. / 82. Reise des FFS "Anton Dohrn" vom 2.8. bis 26.8.1977

Stations cotières et station hydrologique cotière d'Abidjan années 1977, 1978 et 1979

On tables 1 to 12, daily beach surface temperatures are presented. These temperatures are also ploted on figures 2 to 5 in daily values and in 7, 15, 30 days means. Salinity variations are less important than these of temperature (Fig. 6, 7). It follows that during upwelling period, variations of dynamic height anomaly are closely correlated with temperature (Fig. 6 and 8).

Statistiques de pêche en lagune Ebrié (Côte d'Ivoire): 1976 et 1977

In the Ebrié lagoon fishes are mostly caught by means of 6 kinds of fishing gear: small and large mesh gillnets (respectively 1.5-2 and 6.5-8 inches stretched mesh), cast-nets and multi-hooked lines for individual fishermen, and beach seines and ring-nets for collective fishing. Statistical data gathered during 1977 allowed an estimation of total catches: about 6700 tons. The bulk of the catch, 4800 tons, came from beach nets and ring nets, the contribution of which is nearly the same. Individual fishing gear, small mesh gillnets repesenting the main part, account for 25 to 30% of total catch; about 1900 tons for year 1977. Six species, or species groups, comprise more than 85% of the catch. In the Abidjan area, where marine influence is the more noticeable, ring nets are more numerous and their catches increased since 1975. On the other hand, fish captures in unsalted and brackish waters seem to show a stagnancy and a decrease in fish lengths; this phenomenon is probably in connection with beach-seine excessive fishing effort and/or their small meshes (one inch stretched).

Recherches des larves de thonides dans l'Atlantique tropical-oriental: campagnes effectuées en 1976-1977 par le N/O Capricorne

This study gives the results of oblique plankton hauls (from the sea-surface to the top of the thermocline), made during the dry season (January to March) by oceanographic vessel R.V. Capricorne during three cruises, of tuna larvae research in 1976 and 1977, between the African Coast and the Equator, from 17 degrees W to 9 degrees E.

Seasonal marine growth of Bristol Bay sockeye salmon (Oncorhynchus nerka) in relation to competition with Asian pink salmon (O. gorbuscha) and the 1977 ocean regime shift

Recent research demonstrated significantly lower growth and survival of Bristol Bay sockeye salmon (Oncorhynchus nerka) during odd-numbered years of their second or third years at sea (1975, 1977, etc.), a trend that was opposite that of Asian pink salmon (O. gorbuscha) abundance. Here we evaluated seasonal growth trends of Kvichak and Egegik river sockeye salmon (Bristol Bay stocks) during even- and odd-numbered years at sea by measuring scale circuli increments within each g rowth zone of each major salmon age group between 1955 and 2000. First year scale growth was not significantly different between odd- and even-numbered years, but peak growth of age-2 smolts was significantly higher than age-1. smolts. Total second and third year scale growth of salmon was significantly lower during odd- than during even-numbered years. However, reduced scale growth in odd-numbered years began after peak growth in spring and continued through summer and fall even though most pink salmon had left the high seas by late July (10−18% growth reduction in odd vs. even years). The alternating odd and even year growth pattern was consistent before and after the 1977 ocean reg ime shift. During 1977−2000, when salmon abundance was relatively great, sockeye salmon growth was high during specific seasons compared with that during 1955−1976, that is to say, immediately after entry to Bristol Bay, after peak growth in the first year, during the middle of the second growing season, and during spring of the third season. Growth after the spring peak in the third year at sea was relatively low during 1977−2000. We hypothesize that high consumption rates of prey by pink salmon during spring through mid-July of odd-numbered years, coupled with declining zooplankton biomass during summer and potentially cyclic abundances of squid and other prey, contributed to reduced prey availability and therefore reduced growth of Bristol Bay sockeye salmon during late spring through fall of odd-numbered years.

Lune, Wyre & Furness Fisheries Advisory Committee 4th July, 1977.

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 4th July 1977. The report looks at comments of the Regional Fisheries Officer on the report on specific matters such as different river stretches and water quality. It also includes sea-trout ova and fry propagation and re-stocking programmes carried out and planned in determined rivers: Kent, Leven, Crake, Duddon, Keer and Eea. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Eden & District Fisheries Advisory Committee 28th June, 1977.

This is the report from the Eden and District Fisheries Advisory Committee, which was held on the 28th June, 1977. The report looks at the comments of the Regional Fisheries Officer which includes information on salmon, brown trout and sea trout catches in the River Eden; restockings from Holmwrangle Hatchery to some rivers: Eden, Esk and Tarn. Electro fishing information is also given by river (Cocker, Marron, Ellen, Glenderaterra, Ehen, Calder, Irt, Esk or Annas)and stream for 1977. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

South & West Cumberland Fisheries Advisory Committee 27th June, 1977.

This is the report from the South and West Cumberland Fisheries Advisory Committee meeting, which was held on the 27th June, 1977. The report contains sections on water resources development in West Cumbria which includes essential short and long term requirements for conservation of migratory fish stocks in the River Ehen. The section on fisheries activities includes salmon, sea trout and brown trout catches; restocking; fish mortalities; fisheries investigations/gravel abstractions in Rivers Annas, Calder, Esk, Newlands Beck, St. John's Beck, Trout Beck and Caldew; and general activities held in Holmwrange Hatchery. It also covers prosecutions and electrofishing carried out in Rivers Cocker, Marron, Ellen, Glenderaterra, Ehen, Calder, Irt, Esk and Annas. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Regional Fisheries Advisory Committee 25th April, 1977.

This is the report from the Regional Fisheries Advisory Committee meeting, which was held on the 25th April 1977. The report contains the minutes of the previous meetings of the Local Fisheries Advisory Committees, fisheries income and expenditure and information on the distribution of licences. The report also includes the National Water Council Review of Discharge Consent Conditions Consultation Paper, and information on fishery byelaws and netting on the Solway Firth. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Mersey & Weaver Fisheries Advisory Committee 7th April, 1977.

This is the report from the Mersey and Weaver Fisheries Advisory Committee meeting, which was held on the 7th April, 1977. The report contains sections on fisheries income and expenditure, fishing licences, and fisheries activities. The section on the fisheries activities looks at fisheries management; stocking of tench, roach and carp; fish mortalities; netting operations and Worthington Reservoir’s stocks. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

Lune, Wyre & Furness Fisheries Advisory Committee 4th April, 1977.

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 4th April, 1977. The report contains information on byelaws, net limitation on the River Lune, Goosanders and Mergansers which concentrates on predation issues of these birds groups upon young salmonids, fisheries income and expenditure and fisheries activities. The section on fisheries activities includes an update on Middleton Hatchery; fishing conditions; and fisheries improvement work on the River Leven. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.