Marine biologist Alison Kock says two shark-killing orcas have chased the great whites further up the coast and their numbers are stable. But marine biologist Enrico Gennari and naturalist Chris Fallows disagree. They say humans are to blame, pointing to commercial fishing boats catching smaller shark species that are an essential part of the great white’s diet. The human impacts, they argue, are causing the great white shark population to decline. #greatwhiteshark #sharks #capetown #marinelife