© Oceanic Institute of Hawaii Pacific University
Grant recipient Katie Hiew will be sharing updates on her Master’s thesis work with yellow tang broodstock at the Oceanic Institute of Hawaii Pacific University under the advisement of Dr. Chad Callan.

12 February 2021

We acquired 40 wild yellow tang in January, prior to the closure of ornamental collections here in Hawaii. We found the largest of the fish available, most of which average about 11cm. This is just at reproductive size, but we were unable to visually identify sexes yet.   

Since their arrival they have been undergoing quarantine and bi-weekly treatments to (hopefully!) rid them of any parasites. It took a few days to get them eating, but they now enjoy pellets, PE mysis, nori, and Yellow Tang Gel which I make special for all our yellows. We lost 2 during the process, and one seems to have mysteriously disappeared. There is one that developed popeye and had to be removed from the group and treated separately, so I’m hoping it will recover. Yesterday was their final treatment, so we are now ready to move forward with getting the fish into their replicate groups and new tanks.  

Yellow tangs in quarantine at the Oceanic Institute

The first trial will look at different sex ratios (1:1, 1:2, and 1:4), so we will separate the chosen fish into these three treatments with 3 replicates of each. They will be housed in outdoor, 4T fiberglass tanks on OI’s flowthrough seawater. These tanks still need some adjustments made to them and we are working on a design for collecting the eggs within these tanks. In the past, it has taken quite some time to get wild yellow tang spawning anything viable, so that, combined with their relatively small size and the current winter temperatures here may be a challenge. I’m hopeful that after we get them settled into their new tanks and water temps start to come up over the next few months we’ll get some spawns so I have data to report.”  

Yellow tangs in quarantine at the Oceanic Institute