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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...
The fecundity of cod from the southern Baltic Sea in the late 1990s was estimated from 461 pairs of ovaries at the maturity stage IV (according to Maier′s scale). Number of eggs per female was estimated for different length, weight, and age classes of fish obtained from the ICES subdivisions: 25 (Bornholm Deep) and 26 (Gdańsk Deep). Absolute fecundity in relation to body length and age, as well as...
Background. There is still a widespread notion that bony fishes with high fecundities are more productive and therefore more resistant to overexploitation. The purpose of this study was to formally explore the relationship between fecundity and reproductive success expressed as maximum annual reproductive rate, i.e. the number of new spawners produced by existing spawners at low population densities...
The Danube ruffe, Gymnocephalus baloni Holčík et Hensel, 1974, is a little-known species from the middle and lower Danube River. The relevant information on its habitat, maturity, fecundity, spawning season, maximum size and age, as well as its growth and length–weight relation are provided herewith from the Desna River, Ukraine. The estimation of fecundity ranged from 5072 to 15 730 eggs within the...
Background. Rabbitfishes, Siganus rivulatus and S. luridus, are among the most successful invaders in the Mediterranean Sea but population parameters in their new environment are barely known. Fecundity and condition are key parameters of fish populations and their assessment is very important for exotic species; this information is needed to properly evaluate their reproductive and invasive potential...
Background. Limited information is available on the reproductive biology of grey mullets mainly because it is very difficult to collect fully mature specimens. In the presently reported study the reproductive biology of two mugilid species, namely Liza saliens and Liza ramada, was studied in the Vistonis and Porto Lagos estuarine systems. Materials and methods. Gonadosomatic index (GSI) and standard...
Background. Loach fishes, Cobitis sp., are found in the majority of streams in the southern Caspian Sea basin, but reproductive parameters of them are barely known. Reproductive conditions are key parameters of fish populations and their assessment is very important for several reasons. Therefore, the main aim of this study was to obtain reproductive characteristics of this fish which will be a first...
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