Salmon (Salmo salar L.) and trout (Salmo trutta L.) fishing and stocking in the lower Odra River system

Abstract

The paper presents and analyzes the catches of salmon and trout in the Szczecin Firth and lower Odra River as well as in the rivers Warta and Notec over the period of 1952-1972. The both species had to be treated jointly because such is the case with informations given by the economic statistics avai lable to the authors. A year-to year, between-season and between-region variabilities were considered. Fish caught by the German (GDR) fishermen were also taken into account. Additionally, the postwar data concerning the lower Odra stocking with salmon and trout are collected.

The occurrence of salmon (Salmo salar L.) in the Szczecin Firth and lower Odra in1974

“…1.3% and 98.7% of individuals caught from the Szczecin Firth and Lower Odra were assigned fo salmon and trout, respectively. Thus, similarly to the year 1973 (Chelkowski et al,1976 a) salmon clearly occur much less abundantly than trout.…”

Feeding of sea trout (Salmo trutta L.) migrating upstream for spawning in lower Oder River system

“…This system embraces lower stretch of the Oder River and its tributaries as well as some small rivers flowing directly to the Szczecin Lagoon: W okzenica, W olcza, Gowienica and Ina (Fig. 1) (Chelkowski et. al.…”

“…1). According to Chelkowski et al (1976Chelkowski et al ( , 1976Chelkowski et al ( a, 1977Chelkowski et al ( , 1978Chelkowski et al ( , 1979Chelkowski et al ( , 1980, these two supply to the market most of sea trout caught by fishermen in Polish part of the Szczecin Lagoon and in lower Oder. The purchasing cer:tre in Stokzyn buys fish .…”

“…Consictency and colour of intestine mucus was also nc, ted. Studies on focd composition were carried out in 1982-1984, in the months of mere intensive fishing in the Gulf of Szczecin and lower Oder (Chelkowski et al 1976). Totally 655 food tracts were analysed.…”

Occurrence of salmon (Salmo salar L.) in the Szczecin Firth and Lower Odra in 1976

“…Another, equally important, objective was to detect seasons of adult salmon homing into the River Odra system and kelts seaward migration. The study described is a continuation of research on salmon migrations within the River Drawa, a thirdorder tributary to Odra (Chelkowski et al 1976 a;Chelkow ska 1977, 1978).…”