Killer whale
Information for offshore regions and warmer waters is more scarce, but widespread sightings indicate the killer whale can survive in most water temperatures. They have been sighted, though more infrequently, in the Mediterranean, the Arabian Sea, the Gulf of Mexico, and the Caribbean. Over 50 individual whales have been documented in the northern Indian Ocean, including two individuals that were sighted in the Persian Gulf in 2008 and off Sri Lanka in 2015. Those orcas may occasionally enter the Red Sea through the Gulf of Aden. The modern status of the species along coastal mainland China and its vicinity is unknown. Recorded sightings have been made from almost the entire shoreline. A wide-ranging population is likely to exist in the central Pacific, with some sightings off Hawaii. Distinct populations may also exist off the west coast of tropical Africa, and Papua New Guinea. In the Mediterranean, killer whales are considered "visitors", likely from the North Atlantic, and sightings become less frequent further east. However, a small year-round population is known to exist in the Strait of Gibraltar, mostly on the Atlantic side. Killer whales also appear to regularly occur off the Galápagos Islands.
Churna Island
On 14 September 2017, a mother blue whale was spotted near the island along with her cub. The mother was 17 meters in length. This was a first sighting of a living blue whale in the Pakistani sea, as previous blue whales were just beached skeleton of the dead whales with last specimen was observed at Khuddi Creek along the coast of Sindh in August 2014. There have been 47 sightings of Baleen whales in this area but none of them was blue whale.
On 22 November 2017, a killer whale was spotted near the island, it is a rare sighting as killer whales are found in deep water where as thedepth of the water where the whale was sighted was only 72 meters deep. It was also first sighting of killer whale in Karachi as no killer whale was reported in this area since 2003.
Other marine life around Charna includes yellow-bellied sea snake, great barracuda, narrow-barred Spanish mackerel, cobia, mahi-mahi, skipjack tuna, angel fish, sea urchin, sea fan, oyster, ray fish and rare green turtle. Pakistan Game Fishing Association (PGFA) holds national angling competitions near Charna. It is the presence of coral reefs around this island that attracts the number of big game fish around it. However, illegal net sizes used by fishing trawlers are destroying this natural treasure.