Kordian Trella
Sea Fisheries Institute, Kołłątaja 1, 81-332 Gdynia, Poland
Key words: Vistula Lagoon, brackish water basin, Perca fluviatilis, Rutilus rutilus, Pelecus cultratus, Osmerus eperlanus, Scardinius erythtrophtalmus, Gymnocephalus cernuus, growth rate.
Abstract.
The growth rate of perch, razorfish and rudd in the Vistula Lagoon was linear.
That of roach, ruffe and smelt was expressed using the von Bertalanffy equation.
The equation coefficients for the various species were as follows:
perch: | a = 3.05; | b = 4.38 | |
razorfish: | a = 3.04; | b = 9.76 | |
rudd: | a = 2.68; | b = 5.68 | |
roach : | L_{inf} = 44.96; | K = 0.082; | t_{0} = -1.567 |
ruffe: | L_{inf} = 18.62; | K = 0.206; | t_{0} = -0.897 |
smelt: | L_{inf} = 29.37; | K = 0.301; | t_{0} = -0.086 |