During the day, attendees took on a variety of roles to help maintain the hatchery, ranging from nightly feedings and tank cleanings, to larval counts and fishing for broodstock.
Attendees also witnessed the feeding of nine tuna ranging from 35 kgs to 70 kgs and plans were laid out for three different sets of experiments to try and increase larvae survival over the first few weeks.
There were two control tanks, two increased air supply and 24 hour light tanks, and two airflit tanks. The aim was to try and stop tuna larva settling on the bottom of the tank, which is seen to be a major cause of mortalities.
Spawning collection tonight was over one million eggs, fertilisation rate was lower at about 60 per cent but with most of the yolk-sack larvae being used as feed for the tuna juveniles.
Further Reading
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