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Abstract
The paper presents and analyses catches of sea trout and salmon in the lower Odra River system during the period of 1973-1987. Both of the fish species had to be treated jointly for complying with the economic statistics, having been the source of information concerning the catches. The variations of catches were taken into account with regard to years, months as well as regional division. More over data were accumulated as to the stocking of the lower Odra water system with sea trout and salmon during the period of studying the catches.
Highlights
Sea trout (Salmo trutta L.) and salmon (Salmo salar L.) are found to appear in the lowerOdra system that belongs in part to Poland andGermany (Fig. 1)
The comparison of catches and the stocking effects involving the two periods may turn out to be an interesting pro blem, as exploratory, and as economical one. Both of these fish species had to be treated jointly as it has been done in the economical statistics, the latter being the source of information concerning the catches
On the basis of assembled and elaborated material, the catches of salmon and sea trout in the lower Odra system, in the years 1973-1987, claimed the total of 69675 kg, there of 57584 kg were caught in the Szczecin Firth, 11757 kg in the lower Odra and as many as 354 kg in Drawa river (Table 1)
Summary
Sea trout (Salmo trutta L.) and salmon (Salmo salar L.) are found to appear in the lowerOdra system that belongs in part to Poland andGermany (Fig. 1). The comparison of catches and the stocking effects involving the two periods may turn out to be an interesting pro blem, as exploratory, and as economical one. Both of these fish species had to be treated jointly as it has been done in the economical statistics, the latter being the source of information concerning the catches. Investig1>Uon of catches proceeding in such a manner may indicate the route, period !1.nd intensity of spawning migrations of sea trout and srumon, l:unl.ng grown cm the ;:;ea feeding gri.rm:ids, and in water of the lower Odra system
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