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Our crew films some of the diverse cichlid species that dominate the fresh waters of Lake Malawi. In South Africa, a pod of common dolphins races along the Eastern Cape coast, signalling the start of the annual sardine migration. Also in South Africa, an array of colourful creatures, from sea goldies to regal angelfish, inhabit a busy reef.

Pelagic sharks off the coast of South Africa's Western Cape search for a meal, while the crew withstands rough seas and low visibility to film a moray eel, schools of fish and a black coral tree in KwaZulu-Natal. In Mozambique's Pomene estuary, a curious malabar rockcod is not perturbed by the presence of our divers.

Seals play in the shallow waters off the coast of South Africa's Western Cape, while bluefin kingfish go on the hunt in KwaZulu-Natal. Finally, the crew heads to Ponta Mamoli in Mozambique where cleaner shrimp feed on the parasites on a moray eel.

Off the coast of South Africa's Western Cape, a tiny octopus drifts through icy waters before disappearing into a rock crevice. Sergeant major fish protect their eggs from a school of hungry goldbar wrasse on South Africa's Stringer Reef while cleaner wrasse eagerly feed on parasites in Ponta do Ouro, Mozambique.

In the waters off Mozambique's Vamizi Island, a cleaner wrasse wriggles inside the gills of a goatfish in search of parasites to eat, while in Ponta Malongane, the crew films an array of aquatic life, including moray eels and a massive loggerhead turtle. Finally, we journey to the Seychelles where small, healthy groups of coral are beginning to thrive.

A goatfish sifts sand with its tendrils as it searches for food in South Africa's KwaZulu-Natal province and the tide sweeps nutrient-rich waters into Micronesia where masses of fish feed on plankton. Corals and oysters flourish in Mozambique's Vamizi Bay and resident moray eels peek out of rock crevices in Ponto do Ouro.

Grant Brokensha films a pod of humpback whales before encountering an array of marine life on South Africa's Stringer Reef. The crew comes across a number of pelagic predators in the waters off the coast of Micronesia. Finally, Graeme Duane enjoys a swim with the biggest fish in the ocean, the whale shark.

In this week's episode, Graeme Duane takes a look at sharks on South Africa's Aliwal Shoal. Next, we travel to Mozambique, where our crew discovers a range of interesting underwater creatures including a crowned seahorse on the hunt. Finally, pods of southern right whales find shelter from the chilly wind.

Our latest Marine Highlights episode takes us from South Africa's warm East Coast to the cooler waters of the West Coast. Grant Brokensha explores some of his favourite KwaZulu-Natal reefs while Barry Skinstad films agile seals in the colder and more nutrient-rich waters of the Cape.

In this week's episode, a potato bass scans a busy cleaning station for a potential meal and clownfish go about their business in the safety of their anemone homes. In South Africa's KwaZulu-Natal, cameraman Graeme Duane films the small creatures that thrive among the soft corals and seaweed of the intertidal zone.

A common octopus manoeuvres around gullies and rocky ledges as it searches for suitable prey in this week's episode. In the dark depths of Raggie Cave, Graeme Duane encounters several battered-looking ragged-tooth sharks. Finally, Barry Skinstad films dolphins as they attack a baitball from all sides off the Eastern Cape coast in South Africa.

Seabirds, dolphins and sharks gather to feed as the main shoal of sardines begins to arrive along the KwaZulu-Natal coast in South Africa. Another large predator, the Bryde's whale, also makes an appearance.

The 88 countries that make up the International Whaling Commission (IWC) are meeting this week to decide whether or not to resume commercial whaling, which has been banned for 25 years. The draft plan under discussion would allow certain countries to hunt whales commercially for 10 years – including in Antarctic waters. Could this deal bring the IWC more power over whaling countries and lead to a reduction in the overall number of whales killed, or could it become open to abuse and spark more demand for whale products? Know the facts and join the debate. Greenpeace: http://www.greenpeace.org International Whaling Commission (IWC): http://www.iwcoffice.org/commission/iwcmain.htm#conversation Whale and Dolphin Conservation Society (WDCS): http://www.wdcs.org

Common dolphins feature extensively in this week's Marine Highlights episode. Off South Africa's eastern coast, dolphins make an appearance when cameraman Barry Skinstad explores some of the region's beautiful reefs. Next, a morning dive in the warmer waters of KwaZulu-Natal leads to more dolphin sightings. Back in the Eastern Cape, the presence of dolphins alerts the camera crew to some sardine action.

The Gulf of Mexico oil spill is the worst environmental disaster the US has faced. Toxic oil from the Deepwater Horizon well threatens the region's sensitive shorelines and the nesting birds along the Louisiana coast. But there's another species at serious risk: the Atlantic bluefin tuna. This special marine podcast takes the form of an urgent warning about the future of the species. The spawning habitat of the bluefin tuna overlaps with the oil-spill zone and the disaster comes right at the peak of spawning season. The larvae might not withstand the toxic effects of the spilled oil. The bluefin tuna is already living dangerously close to the edge thanks to overfishing and climate change. The Deepwater Horizon catastrophe could wipe out the region's bluefin populations forever. You can help save the bluefin tuna by joining the campaign to create more Marine Protected Areas here: http://tinyurl.com/28q2dnu.