Toshi's work

Mass mortality of anchovy at Ex Ballenera Iquique, Chile October 16, 2016 Masatoshi Futagawa There are many anchovies washed shores at Ex ballenera Iquique Chile on the afternoon October 15, 2016. Those anchovy show weak condition, still alive when the fish reached to the beach. It smelled rotten fish odor and many birds gathered at the area who take those anchovy. The same incident occurred that 600 ton of anchovy dead at Oueule, south of Chile, on last July. Additionally, we observe many birds at surface along Iquique coast that suggest possibly same incident occurring since last month.       I collected some live samples, 4 males and 4 females (TL 12 – 13 cm) at the beach. Based on the optical observation, not using microscope, the fishes show clean and fresh gills and matured, gonad color orange, and intestine has contents.           According to the observation, suspected reasons of the incident are as follows. ...

According to the my log in Aug. 30, I produced anchovy juvenile with SIPS (Semi Intensive Seed production) and it harvested at Day 52 (52 days post hatch-out) on Sept. 24, 2011. We collected 258 juveniles (TL 41.7 mm, SL 35.4 mm, BW 0.31 g) and survival rate shows 1.5 %. Average water temperature shows 16.8 C during the culture period (75 days). Raw sea water introduced to tank (60 tons concrete rectangle) at 50 % of volume through 1 mm mesh bag net in July 11. The water are supplied gradually and filled up to 60 tons within  a week and during this time agricultural fertilizers (Nitrate 3 ppm and Phosphate 0.5 ppm) are applied four times to increase phytoplankton bloom. The water color changed to green at first week and then it sift to brown one. Even so, the transparency never reached to less than 1m. Several species of Copepods are bloomed from 7th week and those are observed that accumulated at surface during the morning time.   Anchovy broodstock ...

Wild anchovy ( Engraulis ringens ) are collected a off-Iquique and stocked at Arturo Prat Univ. Marine Science Lab at Huaiqique in July 31, 2001. The fish spawned at night in same day, forms oval (1.2x0.6mm), floating surface, and 25,618 eggs are incubated in conical tank. The eggs hatched-out 55 hours after fertilization at WT 15 C approximately. Hatch-out rate shows 80 % and 16,771 larvae (Day1) were stocked in 60 ton tank and rearing with SISP (Semi-Intensive Seed Production) method in August 4.