Period of downstream migration of sea trout (Salmo trutta L.) smolts grown in Osówka Stream and their characteristics

Chełkowski, Zygmunt

doi:10.3750/aip1990.20.2.03

Cited by 4 publications

(20 citation statements)

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“…The catch of fish was controlled at 7 a.m. and 7 p.m., from 1 March to 15 July, i.e. in slightly wider period when comparing to period of downstream migration in Pomeranian rivers (Chelkowski, 1978(Chelkowski, , 1990Chelkowski and Chelkowska, 1981). After the registration of number of fish captured, smolts were released back to Gowienica, below the weir mentioned above.…”

Section: Methodsmentioning

confidence: 99%

“…temperature .17 Data concerning the period of intensification as well as water temperature during the downstream migration of smolts studied in Gowienica and Pomeranian rivers -Rega, Os6wka, Molstowa (Chelkowski 1978(Chelkowski , 1990Chelkowski and Chelkowska, 1981) appeared to be similar. Downstream migration in rivers mentioned takes place from March 29 to June 11, while in Gowienica from March 24 to June 18.…”

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confidence: 96%

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Period of downstream migration of sea trout (Salmo trutta L.) smolt grown in Gowienica River

Chełkowski¹,

Chełkowska²,

Ciupiński³

1994

Acta Ichthyol. Piscat.

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Section: Methodsmentioning

confidence: 99%

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confidence: 96%

Period of downstream migration of sea trout (Salmo trutta L.) smolt grown in Gowienica River

Chełkowski¹,

Chełkowska²,

Ciupiński³

1994

Acta Ichthyol. Piscat.

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“…The materials presented in ilie present paper were partly used in the publications of Chelkowski (1990Chelkowski ( , 1993 and Chclkowski et al (1981Chclkowski et al ( , 1994.…”

Section: Methodsmentioning

confidence: 99%

“…Migrations of smolts of the brown trout (Salmo trutta morpha trutta Linnaeus, 1758) (Krzykawski et al 1984), grown in the natural conditions in a number of Pomeranian rivers: the Gowienica, Molstowa, Os6wka, · Pars�ta, and the Rega were studied by Chelkowski (1978Chelkowski ( , 1990Chelkowski ( , 1993, Chelkowski et al (1981Chelkowski et al ( , 1994, and D�bowski et al (1992). A limited information on the migration of smolts of the Atlantic sal:mon and the brown trout in the lower Pars�ta was provided also by Eichelbaum (1916).…”

Section: Introductionmentioning

confidence: 99%

The course of migrations of smolts of the brown trout (Salmo trutta m. trutta L.) grown in the rivers of Pomerania

Chełkowski¹

1995

Acta Ichthyol. Piscat.

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In the present report the daily seaward migrations of the brown trout (Salmo trutta m. trutta L.) smolts, grown in natu ral conditions in Pomeranian rivers: the Molstowa, surveyed for one season, the Gowienica-for five seasons, and the Os6w ka-for two seasons, were analyzed. The intensity of the .mi grations was related to the water temperatures and the moon phases. The above studies were based on a total of 5593 acqu ired smolts.

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“…smohs of Os6wka stream appeared to be similar. Ovaries and testes of smolts grown from larvae feeding, according to Chelkowski [1992], as well as from fry were :in the juvenile stadium, in the first stage of Maier's scale. Coefficients of gonads maturity, too, were similar in two compared smolts groups from Osowka.…”

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Biological characteristics of sea trout smolts (Salmo trutta m. trutta L.) grown from fry released in the Stream Osówka

Chełkowski¹

1995

Acta Ichthyol. Piscat.

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In spring 1987 the fry of sea trout was introduced into the upstream of Os6wka Smolts grown from this material were caught during three successive years after the fish release, with the aid of fish trap situated in the middle course of the stream. Sex, condition and coefficient of gonads development, as well as length, weight and factor condition of smolts of the known age were determined. INlRODUCTION The :SUl'.Vivitl rate of juveniles of sea trout (Salmo trutta m. trutta L.) grown in Osowka lllreaJD-frPni. the introduction of fry to the downstream migration, appeared to be ea three u.nes higherJhan the survival rate of feeding larvae of sea trout till the period of descending [Chelkowski 1993]. Undoubtedly the biological characteristics of smolts grown in Osowka from the introg.u,ced fty ofknown age when comparing to the data given by Chelkowski [1990, 1992) concerniri.g sea. trout smolts grown in the same stream from the feeding larvae of as well bown age, could d� not only the cognitive but also practical value. The present paper is third in a series of studies on sea trout smolts grown in Osowka stream ftom the fty released [Chelkowski 1993, 1993a]. 20 Zygmunt Chelkowski ., MATERIAL AND }METHODS. ' Osowka is one of the small left-side tn"butaries of lower Odra river, having its source in Warszewskie Hills reaching-lJ.l m over the sea level No salntonids-were found in the indigenous ichthyofauna [Chelkowski 1993]. 3080 individuals of sea trout fry in the age of 10 weeks, at the mean length of30.7+o.66 mm and weight of281.6+5.66 g were released into the upper course of Osowka on 7 May, 1987 [Chelkowski 1993]. The fry was obtained from eggs of sea trout captured in the river Rega in autumn, 1986, being under incubation in the deep water, at constant temperature of 8°C. Next the fry was transferred to the rotary pond being swelling with' the same water and fed by dry drop-stuff till the day previous to the release [Trzebiatowski et al. 1992]. Smolts grown from this material were caught during their descent to the sea with the aid of fish trap located in the middle current of stream, working from the 1 March to 15 July 1988, 1989 and 1990, ie. in three successive years after the release. Smolts in Pomeranian J,ivers migrate 4ownstream in spring [Cbelkowski 1990; D1tbowski et al 1992], and their stay jn the river til l thq pimod of descent isili:mited from lt.o 3 years [Chrzan 1959; Dixon 1931; D�owski et al 1992]. Length (1 caud.) in mm and weight in g of gutted and non-gutted smolts (without the alimentary tract, heart, liver, milt and gonads) were estimated. Sex was determined from gonads; their development was established according to 8-stage Maier's scale [Meisner 1948]. Next the weight of gonads was recorded with the accuracy to 1 mg in order to calculate the coefficients of gonad maturity demonstrating the per cent ratio of

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Period of downstream migration of sea trout (Salmo trutta L.) smolts grown in Osówka Stream and their characteristics

Cited by 4 publications

References 1 publication

Period of downstream migration of sea trout (Salmo trutta L.) smolt grown in Gowienica River

Period of downstream migration of sea trout (Salmo trutta L.) smolt grown in Gowienica River

The course of migrations of smolts of the brown trout (Salmo trutta m. trutta L.) grown in the rivers of Pomerania

Biological characteristics of sea trout smolts (Salmo trutta m. trutta L.) grown from fry released in the Stream Osówka

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