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Fecundity of ninespine stickleback [Pungitius pungitius L.,1758] in the Puck Bay

100%

Sokolowska E., Skora K. E.

Acta Ichthyologica et Piscatoria

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2001

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tom 31

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nr 1

Ninespine stickleback is abundant in the brackish waters of the Puck Bay and its catchment area. The species is common in the overgrown littoral zone. Spawning in the bay is extended, lasting from March to August, the eggs are laid in batches. The fecundity of these fish is relatively low, as with others which show parental care. Sticklebacks lay up to 199 eggs, this being higher than the fecundity of sticklebacks from North America and Eastern Europe and lower than in one of the Japanese forms. The relation between absolute fecundity and body length, and body weight is described by the equations: F = 1.8052ּ10-3ּL2.71 and F = 103.77551ּW0.99, respectively. The fecundity of a fish depends primarily on its weight. The body size and fecundity had no effect on egg size.

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Reproductive cycle and the related spatial and temporal distribution of the ninespine stickleback (Pungitius pungitius L.) in Puck Bay

100%

Sokolowska E., Skora K. E.

Oceanologia

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2002

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tom 44

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nr 4

The cycle of gonad development and related changes in the length structure and spatial-temporal distribution of ninespine sticklebacks (Pungitius pungitius L.) in Puck Bay were studied. Observations were carried out in the shallow shore zones, as well as in the deeper epipelagic zone of the Bay. Ninespine sticklebacks reproduce in the brackish environment of Puck Bay, breeding in its warmer, inshore zones. Reproduction takes place in the spring and summer months, from April to July. One female spawns several clutches of eggs during one breeding season. The average length of ninespine sticklebacks in Puck Bay was about 40 mm, and the sex ratio in the population was close to 1:1. However, both length structure and sex ratio were subject to local and periodic variations, resulting from possible breeding-related territorial divisions. Higher gonadosomatic indices in females in early spring represented the transition of fish to the advanced vitelligenous phase. The lowest GSI of males during the breeding season indicated the termination of spermatogenesis. The completion of spawning in August started a new process of gonad restoration to prepare the fish for the next breeding season.

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Parasites of sticklebacks [Actinopterygii: Gasterosteidae] from South-Eastern Baltic Sea [Poland]

100%

Sulgostowska T., Vojtkova L.

Wiadomości Parazytologiczne

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2005

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tom 51

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nr 2

A total of 142 individuals of Gasterosteus aculeatus L. and 22 individuals of Pungitius pungitius (L.) from several areas of the coastal waters of the Gdańsk Bay both brackish- and freshwater were examined for parasites. The survey was carried out within 1988-1991. Six parasite species, namely: Gyrodactylus arcuatus, Apatemon gracilis, Sphaerostomum bramae, Phyllodistomum folium, Neoechinorhynchus rutili, and Argulus foliaceus were recovered from sticklebacks caught in freshwater habitats; while the other 4 parasites: Apatemon annuligerum, Bothriocephalus sp., Schistocephalus solidus, Proteocephalus percae occurred only in fish from brackish-water areas. Additional 5 parasites: Trichodina domerguei, Diplostomum pungitii, Diplostomum spathaceum, Rhaphidascaris acus, and Thersitina gasterostei were recorded in fishes from both habitats.

Ograniczanie wyników

1 Acta Ichthyologica et Piscatoria

1 Oceanologia

1 Wiadomości Parazytologiczne

2 Skora K. E.

2 Sokolowska E.

1 Sulgostowska T.

1 Vojtkova L.

1 2005

1 2002

1 2001

Fecundity of ninespine stickleback [Pungitius pungitius L.,1758] in the Puck Bay

Reproductive cycle and the related spatial and temporal distribution of the ninespine stickleback (Pungitius pungitius L.) in Puck Bay

Parasites of sticklebacks [Actinopterygii: Gasterosteidae] from South-Eastern Baltic Sea [Poland]