Variation in abundance and survival of fish larvae in shallow eutrophic Lake Tjeukemeer

Variations in abundance and survival of larvae of the major fish species, bream, roach, pikeperch, perch and smelt were studied in shallow eutrophic lake Tjeukemeer (1986-1988). Except for smelt, the size of the spawning stock and the abundance of larvae were not related. Both the timing of appearance of larvae and their growth rate were determined by water temperature as was shown by a growth model developed earlier for Tjeukemeer fishes. In cyprinids and percids the survival of the larvae was hypothesized to be negatively related to the duration of the earliest stages. Except in cyprinids, the abundance of 0+ juvenile fish could be explained by the number of larvae. In cyprinids 0+ juvenile abundance at the end of the year was not related to the number of larvae in May and June. The cyprinid juvenile survival rates are hypothesized to be related to the size of the main cyprinid predator, 0+ pikeperch. [KEYWORDS: recruitment; spawning stock; 0+ juvenile fish; temperature; 0+ growth model; mortality; predation; starvation; cyprinids; percids Population-dynamics; rutilus-rutilus; cyclopoid redation; daphnia-hyalina; abramis-brama; south bay; growth; temperature; size; recruitment