PLANET EARTH Shallow Seas

The seals here thrive on a diet of fish and squid. In temperate seas there may actually be more squid than fish. These are chokker squid, and they lay their egg capsules in sandy shallows bathed by the warmer Agulhas Current. Each capsule contains a hundred tiny squid. Within a few days they develop spots of pigment which, when they're adult, they will use to communicate with one another. With females continuing to lay eggs and males still preoccupied with repelling rivals, the squid drop their guard.
Stingray（魟）. Short tailed stingray can be up to two meters across. They're the largest of all the stingrays, and they have appetites to match. Another predator is on the prowl. The aptly named ragged tooth shark. Raggies grow to three meters long, but they share these waters with a shark twice their size.



The great white. The largest predatory fish on the planet. Each dawn cape fur seals leave their colony to go fishing. To reach the open sea, they must cross a narrow strip of water and that is patrolled by great whites. Each seal is indeed swimming for its life. The shark relies on surprise. The great white's turn of speed is powered by a high metabolism. They only thrive in cold temperate seas for only these waters contain sufficient food necessary to fuel such a ravenous predator.