[SOLVED] Do Harp Seal populations effect Atlantic cod? The Atlantic cod population was an extremely abundant stock of primary economic importance to fishing communities throughout the Atlantic provinces. The Department of Fisheries and Oceans has stated that the collapse in Atlantic cod stocks can be attributed to overfishing. Others claim that the use of equipment that disturbs fish spawning sites on the ocean floor is primarily responsible, and still others argue that the harp seal, a predator of Atlantic cod, is responsible for this mass reduction in the cod population. One suggestion to help cod stocks recover is for large numbers of harp seals to be killed. Suggest some ways that marine biologists might study changes to the Atlantic cod population to determine whether the reduction of the harp seal population would be an effective solution. I searched up some stuff such as SEZ (Seal exclusion zone). But how do we determine whether the reduction of harp populations would effect the populations? But methods of mark-recapture?