Fig. 2.

Marking of fish with fluorescent dye. The sexually mature females and males (3-month-old fish of 0.2 ± 0.04 g in body weight) used for the treatments were selected and marked by injection of fluorescent dye (Visible Implant Elastomer Tag, Northwest Marine Technology, NW). Different 8 patterns of color were used to distinguish individuals in a group of 8 fishes. Marked fish were kept in same tank as one experimental group (Fig. 3).