Top 11 Largest Creatures in the Seas and Oceans

The oceans are packed with a variety of life forms ranging from tiny zooplanktons to ferocious predator sharks. They are home to the the largest creatures to have ever existed.

Here are 11 of the biggest sea and ocean animals.

11. The Ocean Sunfish

The ocean sunfish is also called the common mola. While it is number 11 on our list of the largest sea creatures, it does hold the title for the largest bony fish on earth. The ocean sunfish can attain a length of 3.3 m (10.8 ft) and 4.2 m (14 ft) across the fins. The heaviest recorded ocean sunfish is 2,300 kg (5,100 lb).

10. Japanese Spider Crab


The Japanese spider crab is the largest arthropod in the sea. It is a clumsy-looking crab with long legs that can span 5.5 meters  (18 ft). The body itself is small, measuring only 40 cm (16 in) in width and with the whole animal weighing just 19 kilograms.

9. Giant Oarfish

The Giant Oarfish is the longest bony fish. It can grow as long as 11 m (36 ft) although there have been unverified reports of the fish reaching 17 m (56 ft). It grows to pack on a weight of up to 270 kg (600 lb).

8. The Great White Shark

Male great white sharks are smaller than females. The largest females can grow to lengths of up to 6.1 m (20 ft) with weights of 1,905 kg (4,200 lb) when fully grown.

7. The Killer Whale

The killer whale is a robust dolphin with a large powerful body. Males are larger than females and can mature to reach a length of 8 meters (26 ft), weighing 6 tonnes. The largest killer whale on record weighed 10 tonnes and measured 9.8 m (32 ft) in length.

6. Lion’s Mane Jelly

The Lion’s Mane Jelly Fish also holds the title of one of the longest animals on earth. That is because its tentacles have been known to reach over 30 meters in length (120 ft), longer than the blue whale. The bell itself grows to a diameter of only 2 meters (6 ft 7 in).

5. Giant Manta Rays

The giant manta ray is able to reach a length of 7 m (23 ft) across and pack as much as 3,000 kg (6,600 lb) in mass.

4. Sperm Whale

The sperm whale is the largest toothed predator on earth. It can grow to record lengths of 20.5 meters (67 ft).

3. The Whale Shark

The Whale Shark may be the 3rd largest sea animal on this list but it still is the largest nonmammalian vertebrate. Records show that the longest known whale shark was 12.65 m (41.5 ft) and a weight of 21.5 t (47,000 lb).

2. The Fin Whale

The biggest fin whales can grow to lengths of 25.9 m (85 ft) but there have been unverified reports of these sea animals growing to 27.3 m (89.6 ft) long and weighing 74 tonnes. The largest unverified weight is 114 tonnes.

1. The Blue Whale

The blue whale is the largest animal known to have ever existed, being much larger than the extinct dinosaurs. When mature, it has been known to grow up to 29.9 meters (98 ft) long and weigh 173 tonnes.

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