Urho, 1996



Citation


Urho, L. (1996) Habitat shifts of perch larvae as survival strategy. Ann. Zool. Fennici, pp. 329-340

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Perca fluviatilis Spawning conditions Spawning substrate Perch accept a wide variety of substrates on which to deposit spawn, which they generally drape or wind round the chosen object in order to hold it clear of the lake bed No category
Perca fluviatilis Spawning conditions Spawning temperature 12-14°C 13.0 °C
Perca fluviatilis Spawning conditions Spawning depth Spawn in shallow water (usually <3m), althoug egg-masses are know to deposit at depths of 4 to 14 m in some deeper lakes 3.0 m
Rutilus rutilus Spawning conditions Spawning season Perch spawned between 16 and 24 May (peak 17-19 May) near the shoreline on branches. Roach spawned at the same time as or a few days earlier than perch ['May']
Perca fluviatilis Spawning conditions Spawning season Perch spawned between 16 and 24 May (peak 17-19 May) near the shoreline on branches ['May']
Perca fluviatilis Larvae Temperature during larval development Direct mortality of perch larvae occurs if the temperature drops below 10-12°C 11.0 °C
Perca fluviatilis Larvae Onset of exogeneous feeding On 27 and 28 May half of the perch still had some yolk left and 90% had started feeding. Hatching at 24 May and temperature 12-14°C 13.0 °C * day
Rutilus rutilus Larvae Larvae behaviour Roach spawned in the middle of May, and on 24 May the yolk sac larvae were observed hanging on plants. Two days later almost all the roach larvae caught had gas in the swim bladder, although the majority still had some yolk left. Most of the orach larvae caught the next day had started feeding. By the last day of May, the mean length of roach larvae was 8.5 mm and the flecxion stage was just beginning with temperature between 12-14°C Demersal
Esox lucius Larvae Larvae behaviour Pike perch hatched in the middle of May. After using their yolk whille still hanging on plants, pike larvae with some gas in the swim bladder were caught among the vegetation at the same time as the first roach and perch larvae hatched (24 May) Demersal
Lota lota Larvae Larvae behaviour Dispersed earlier at the yolk-stage and ended up in the littoral Demersal
Perca fluviatilis Larvae Larvae behaviour Larvae are known to move out into the pelagic area and after some time return to shallow-water areas Pelagic