Ontogeny of turbiditaxis in hatchery-reared Japanese anchovy Engraulis japonicus

The ontogenetic change in turbiditaxis (i.e. attraction to turbid waters) was examined in the larvae and juveniles of Japanese anchovy Engraulis japonicus by testing three levels of turbidity (0, 20 and 100 ppm of kaolin). Larvae of 12, 20 and 30 mm standard length (L_S ) exhibited turbiditaxis to both 20 and 100 ppm of kaolin, whereas 6 mm L_S larvae and 45 mm L_S juveniles did not exhibit any turbiditaxis. Turbiditaxis might explain the ontogenetic habitat shift from coastal to offshore waters reported for this species.