Ontogenetic shift in nocturnal microhabitat selection by giant kokopu in a New Zealand stream

Nocturnal microhabitat selection in relation to size was examined for a New Zealand drift-feeding freshwater fish, the giant kokopu Galaxias argenteus in three coastal Otago streams. Evidence for ontogenetic shifts in microhabitat selection were observed, particularly with respect to water velocity and depth. Small (<80 mm) giant kokopu tended to occur in shallow backwaters adjacent to fast flowing water. In contrast, larger individuals (≥80 mm) were most commonly observed in deeper, slower flowing pools. These patterns of habitat selection are most likely associated with the trade-offs involved with the selection of optimal habitats for drift feeding combined with avoidance of intra-specific competition and the threat of predation from larger conspecifies.