Urho, L. (1996) Habitat shifts of perch larvae as survival strategy. Ann. Zool. Fennici, pp. 329-340
| Species | Development state | Trait | Primary Data | Secondary Data |
| 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 |
| 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'] |
| 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 |
| Perca fluviatilis | Larvae | Larvae behaviour | During the next four days, the yolk sac larvae of perch were mainly caught in the pelagic area [Perch start to swim immediatly without filling the swimbladder first] | Pelagic |
| 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 |
| 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 | 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 | 14.0 m |
| 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 |