ACTA ICHTHYOLOGiCA ET PISCATORIA

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1 ACTA ICHTHYOLOGiCA ET PISCATORIA Vol. X Fasc. l Szczedn 1980 Zygmunt CHELKOWSKI, Boiena CHELKOWSKA Fish biology ON THE OCCURRENCE OF SALMON (palmo SALAR L.) IN THE SZCZECIN FIRTH AND IBE JLOWER ODRA IN 1977 WYSTJ;;POWANIE LOSOSIA (SALMO SALAR L.) W ZALEWIE SZCZECINSKIM I DOLNEJ ODRZE W 1977 R. Institute of Aquaculture and Fisheries Technology The paper summarises data on numbers, weight, regions and seasons of captu e of salmon (Salmo salar L.) within the Polish part of the Szczecin Firth and the lower Odra in The fishes caught ar considered in terms of their respective affiliation to the spawning and post-spawning stocks. INTRODUCTION The object of the present report is to determine numbers and weights of salmon (Salmo salar L.) occurring in catches from the Polish part of the Szczecin Firth, lower Odra, lower Warta, and Notec rivers in The seasons of spawning migration of adult salmon and of the seaward migration of kelts, i.e., spent fishes, are considered. The work presented is a continuation of studies on the seasons of salmon migration in the river Drawa, the third-order tributary of the Odra (Chelkowski et al., 1976 a.; Chelkowski and Chelkowska, 1977, 1979). MATERIAL AND METHOD The joint 1977 salmon (Salmo salar L.) and trout (S. trutta L.) catches from the Polish part of the Szczecin Firth and lower Odra was kg of gutted fish, kg of

2 Table l Number of individuals and weight of salmon examined in 1977 region month Kamie:ri Pomorski ind. kg HI IV V VI VII vm IX X XI XII Total ind kg c: ind. 1 l. i::i µ., Lubin.s kg Q)!j ind. l l 1 3 Trzebiez kg Total: Stokzyn ind. l kg ind. 1 1 kg D!!bie ind. 1 1 "' kg Q) Gryfino Total: Grand total: ind. 1 1 kg ind. 1 2 kg U7 I ind kg

3 Number of individuals and weight of trout examined in 1977 Table 2 reg'on r.. month ind. HI N V VI VII VIII IX X XI XII Total jlcg Kamien ind Pomorski kg ind Swinoujscie kg Przytor Lubin Kax,;iborz iud kg ind kg ind kg a ind Wolin N k ind Nowe Warpno Trzebie± ind kg ind. I Stepnica k Total ind kg ind. l Stolczyn kg I.SO "' ind ,13 D,µ,ie 0 kg 3.09 l ind :l Widuchowa Total ind k ind Grand total: kg kg

4 62 Zygmunt Chelkowski, Bozena Chelkowska which, i.e., 96.28% were examined taxonomically, the remaining catch being subject to a general examination. No salmon and trout occurred in 1977 in catches from the lower Warta and Notec. The methods used were described in Chelkowski et al. (1976, 1976 a). RESULTS The total material examined was found to contain 10 salmon and 4 73 trout individuals whose respective total weights were and kg (Tables l and 2). The Szczecin Firth yielded 7 salmon and 365 trout individuals weighing altogether and kg, respectively, while 3 salmon and 108 trout individuals, weighing - respectively and kg - were caught from the lower Odra. Further calculations showed mean individual weights to be 8.86 and 2.59 kg for salmon and trout, respectively, while mean individual lengths of the respective species were and cm. 5 salmon individual were found to have been caught when migrating to spawn and the remaining 5 were descending seawards when captured. The salmon kelts were found in catches from 30 March through 5 May, while the salmon migrating to spawn were caught from l through 29 September. fllh.tic SfA Fig. 1. Sites of salmon capture: a) salmon going to the sea. "kelts" b) salmon entering the river - "adults", c) state border

5 On the occurrence Kelts were caught in the Szczecin Firth off Kamien Pomorski and Lubin (1 individual in each area) and off Trzebiez (2 individuals} as well as in the lower Odra off Stolczyn (1 individual). Those salmon migrating to spawn were caught in the Szczecin Firth off Trzebiez (I individual), Kamieri Pomorski (2 individuals), and in the lower Odra off Dqbie and Gryfino (1 individual in each area) the detailed location of the salmon capture sites is shown in Fig. l. Conclusions The studies presented showed salmon to have occurred in the 1977 catches from both the Szczecin Firth and the lower Odra. The total 1977 catches were made up of 2.07% of salmon and 97.93% of trout. The Szczecin Firth and lower Odra salmon 1977 post spawning migration proceeded from March through May, while the spawning migration took place in September. REFERENCES Che-lkowski Z., Chetkowska B., l!gsielnkka H., 1976: Salmon (Salmo salar L.) and Trout (Salmo trutta L.) fishing and stocking in the lower Odra River system.- Acta Ichthyol. et Piscatoria VI, 1: Chdkowski Z., Chelkowska B., Kisielnicka H., 1976a: The occurrence of salmon (Salrno salar L.) in the. Szczecin Firth and Lower Odra in Acta Ichthyol. et Piscatoria VI, 2: Chelkowski Z., CheUmwska B., 1977: The occurrence of Salmon (Salmo salar L.) in the Szczecin Firth and Lower Odra in Acta Ichthyol. et Piscatoria VII, 2:3-8. Chelkowski Z., Che-1:kowska B., 1978: Occurrence of Salmon (Salmo salar L.) in the Szczecin Firth and Lowet Odra in Acta Ichthyol. et Piscatoria VII, 1 : Chel:kowski Z., Chelkowska B., 1979: Occurencee of salmon in the Szczecin Firth and lower Odra in Acta Ichthyol. et Piscatoria, IX, 2: Translated: mgr Teresa Radziejewska WYSTF;POWANIE LOSOSIA (SALMO SALAR L.) W ZALEWIE SZCZECINSKIM I DOLNEJ ODRZE W 1977 ROKU Streszczenie Polow lososi (Salmo salar L.) i troci (Salmo trutta L.) w polskiej czysci Zalewu Szczeciri.skiego i do!nej Odrze w 1977 r. wyniosl: 1 366,5 kg. Z tego rnaterialu poddano badaniom taksonomicznym 1 315,64 kg co odpowiada 96,28% polowu tych dwoch gatunkow ryb. Pozostaly pol'ow poddano badaniom ogolnym. W pol:owach z dolnej Warty i Noteci lososie i trocie w ww. roku nie wyst:;ipily. (Metody badari. patrz w pracy Chelkowski Z., Chelkowska B., Kisielnicka H., 1976 i 1976a). W badanym materiale stwierdzono wystypowanie 10 lososi o ciyzarze 88,55 kg i 473 troci o civzarze 1 227,09 kg. W tym z Zalewu Szczecinskiego pozyskano 7 lososi o civzarze 56,38 i 365 troci

6 64 Zygnmnt Chelkowski, Bozena Chetkowska o ciyzarze 935,28 kg oraz z dolnej Odry 3 fososie o ciyiarze 32,17 kg i 108 troci o cii,zarze 291,81 kg. Z dalszych obliczen wynika, ie sredni civzar jednostkowy wyni6sl 8,86 kg przy sredniej dl:ugosci 100,9 cm dla lososi i 2,59 kg przy sredniej dlugosci 61,96 cm dla troci. Na og6lnq ilosc wystypujqcych w badaniach lososi 5 odbywaj:o Wydr6wk1, potarlow:i i 5 wydr6wkv tarl:owq. Polow kelt6w lososi przypadl w okresie od 30 marca do 5 maja, a lososi ciqgnqcych na tarlo w okresie od J do 29 wrzesnia. Pol6w kelt6w mial: miejsce w Zalewie Szczecinskim w rejonie Kamienia Pomorskiego i Lubina (po jednym lososiu) i w rejonie Trzebieiy (2 lososie} oraz w dolnej Odrze w rejonie Stolczyna (1 losos). Natomiast J:ososie ci:ign11ce na tarlo wystqpil'y w Zalewie Szczecinskim w rejonie Trzebieiy (1 fosos) Kamienia Pomorskiego (2 lososie) oraz w dolnej Odrze w rejonie Dqbia i w rejonie Gryfma (po 1 lososiu). Lokalizacjy miejsc polowu fososi p:rzedstawiono na rys XB.llKOBCKlll, E. XBJIKOBCKa nococ1 (SALMO SALAR L.) B meuwhckom 8ATIWBE w HWIHEM O,llPE B 1977 ro.uy PBSIOMB Bb!JIOB JIOCOCff (Salmo salar L.) JI! KYMJR:lll (Salmo trutta L.) B nojibckom 30- HB mbulllhckoro sajilllba JI! HllllR:HBM O pb B 1977 ro y COCTaBJ/lJI 1366,5 Kr. 3 3TOro KOJIJ/lG:BCTBa 1315,64' Kr. 6h!JIO no BBprHyTO TaKCOHOMJ/lG:BCKJ/lM J/lCCJIB OBaHJ/lffM _! G:TO COCTaBJIHBT 96,28% 06ll\Bro BblJIOBa 3TliX BYX BJ/l OB pb16. B ynobax MS HliJE HBM BapTb! 1,1 HoTeUlll, JIOCOCb lll KYMJR:a.He 6blJIJ/l 06HapylEBHh!. MBTO J/lCCJIB OBaHlllM CM. B pa6otax XeJIKOBCKJ/l 8., XBJIKOBCKa E., KliCBJibHJl!UKa x., 1976, 1976a. B cymme J/lCCJIB OBaJIIil 10 JIOCOCBli, 06ll\lllli BBC KOTOpb!X COCTaBJIHJI 88, 55 Kr lll 473 KYMJR:lll o6mlllm BBCOM 1227,08 Kr. Ws 3TOro J/13 mbulllhckoro sajilllba 6b!JIO 7 JIO COCBM 06ll\lllM BeCOM 56,38 Kr lll 365 KJMJEBM 06ll\llIM BBCOM 935,28 Kr, a B MaTeplllaJIB J/13 HlllJR:Hei.t O pbl 3 JIOCOCM BeCOM 32,17 Kr lll 108 KYMJR:Bli BeCOM 291,81 Kr. Ws J/lCCJIB OBaHJ/lJ/l BhlTBKaBT, G:TO cpb HJ/lli illtyg:hblli BBC COCTaBJIHJI 8,86 Kr nplll CpB Hei.t JIJ/!HB 100, 9 CM JIH JIOCOCH lll 2, 59 Kr rrplll cpb HBM JIJ/!HB 61, 96 CM JIH KYM Jll. Ws 06ll\ero G:J/lCJia lllccjib OBaHHblX nococew 5 COBBpillaJIO YlEB ITOCJIBHBpBCTO Bh!B MlllrpaulllU a 5 - HBpeCTOBble. nob KBJlbTOB rrpobo WJICH B ITBplllO 30 MapTa - 5 MaH, a JIOB JIOCOCH COBBpillBIOll\BrO HBpBCTOBblB MlllrpaUllllll - c 1 ITO 29 CBHTH6- ph. KBJibTOB Bh!JiaBJilllBaJIJ/l B meuj/lhckom ll\alllllbb B paiohe KaMBHb ilomopckj/l W Tiby6JllH (no 1 3K3.) JI! B pai.tohb Tp B6B H (2 3K3.) a TaKJEB B HWJEHBM O pb B paiohe CTaJIG:lllHa (1 sits.). ]ococbil W Yll\lllX Ha HBpBcT B nobw w B pawohe TpJR:e- 6BJR:lll (1 3K3.), KaMBHff IloMopcKoro (2 3K3.) a TaK e B HlllJEHBM O pb B pamohb OM6e H rpbl@mho (no 1 aka.). MecTa BblJIOBa JIOCOC6M npe ctabh6h Ha plllc, 1, IlBpBBo : AP IDae.UoMarana Received: 25 X 1979 r. Address of authors: Dr Zygmunt Chel:kowski Mgr Bo:i:ena Chelkowska Instytut Akwakultury i Technild Rybackiej AR Szczecin ul. Kazimierza Kr6lewicza 4 Polska - Poland

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