Fish food: The roll of death

Our latest install­ment in the Antarctic co-​​op series from stu­dent Eileen Sheehan is a video of her and her North­eastern class­mate Urjeet Khan­walkar feeding the red-​​blooded rock-​​cod N. cori­iceps at Palmer Sta­tion. Here’s what she had to say about the process:

Here Urjeet Khan­walkar and I attempt to demon­strate in our aquarium room on May Day how N. cori­iceps will counter-​​rotate with one another when feeding. By holding the fish filets, we can sim­u­late being another fish holding on to prey. While I let go too quickly, and man­aged to pull the fish a bit out of the water, Urjeet did a great job at showing us how the fish man­ages to turn its body in the water while latching on to the food. In the back­ground you can hear our video­g­ra­pher, Yinan Hu from UMass Amherst, make a couple com­ments about the move­ments of the fish.

N. cori­iceps will “fight” for the food by pulling at the pieces, in our case a fish filet, and turning their bodies in oppo­site direc­tions.  While the main goal is to ensure that either indi­vidual wins the prey, they actu­ally end up helping one another. In the end, both will prob­ably get a piece of flesh because they end up rip­ping it in half with their motion.