Arapaima gigas
Largest freshwater fish in the world. Builds a nest on sandy bottoms where it spawns and protects its young.

http://en.wikipedia.org/wiki/Arapaima

Arapaima, (pirarucu, or paiche) is a South American tropical freshwater fish. It is one of the largest freshwater fish in the world,  with a maximum length in excess of 3 m (9.8 ft.) and weight up to 200 kg (440 lb.).

5 minutes walk from Suria KLCC connecting tunnel

While you are  in KLCC make a visit to Aquaria at KLCC - Kuala Lumpur's first aquarium with over 5,000 marine creatures.

Aquaria KLCC has an amazing display of fish, from sand tiger sharks to blue rays and giant arapaimas to gar fish.

There are also reptiles such as snakes and lizards on display along with a wide variety of insects.

At the entrance there is a special section for  visitors to pick up and feel the texture of live corals and star fish.

Located inside Kuala Lumpur Convention Centre which is a 10 minutes walk from the Petronas Twin Towers, it is accessible through the underground interlink from Tower Records in Suria KLCC.    

To KL Aquaria we walked through an air-conditioned pedestrian walkway at the Centre Court of Suria KLCC to the Kuala Lumpur Convention Centre. It is delightful walk on this walkway with such experience we experience and feeling we could not easily find back home. My son apparently attracted to the posters of Incredible India. To our amazement, in the next 6 days, Indian tourists from India would become our close traveling companions on journey forward.

The amazing Cownose rays measuring up to 150cm in wingspan. Else where we can only watch them on television

There are three shallow pools with swimming creatures where you can touch and catch with your hands. The tunnel underneath the shark-tank (photos below) was  impressive. On this travelator, big sharks, sting rays and other rather large fish swooped overhead or just lazily floated past.

Before the main hall is the  section called the Jewels of the Jungle with amazing variety of animals found in the tropical region. Green snakes, Malayan Horned toads, tarantulas etc.

The main hall contained three main aquariums and a couple of smaller ones.

Teacher (with a cane in right hand) : "I already told you not to disturb the little penguins...."

Boy (crying) : "...Yes Sir ! .......I will not disturb any animal from  now on..."

Boy (very proud) : "Look ! Here I  am, at  the marvelous Taj Mahal  in India. We came here by camels ..... camel riding is more exciting than our Kota Belud's hose riding...."

Boy (shivering) : "Finally I reached Mount Everest .... so high and more difficult to climb then Mt Kinabalu ..... and it is incredible cold here. ....."

• 5 minutes walk from Suria KLCC connecting tunnel    

• 8 km from KL Sentral Station, 80 km from KLIA International Airport“ ocean of discovery ” at Aquaria Kuala Lumpur Convention Centre.

Aquaria KLCC is the first commercial aquarium in Kuala Lumpur and a wonderful place to spend the school holidays with the family.

This  RM60 million aquarium featuring some 5,000 aquatic and marine animal exhibits of over 150 different species from Malaysia and around the world.

Boasting of an area spanning two levels and covering over 5,500 sq m, making it the largest in the world, the Aquaria has 19 tanks with various environments to keep and display fishes from various parts of the world.

Showcasing some of the most captivating aquatic life from Malaysia and throughout the world, Aquaria KLCC takes you on an exciting journey from the misty mountains, down the majestic rivers, through the green rainforest to the mighty mangroves until you reach the colourful coral reefs and the ominous deep blue sea.
 

Discover what it is like to drift through the tropical rainforests. Wade through shallow waters as stingrays slip and glide. Find out how it feels to be swimming side by side with Sand Tiger Sharks. With over 5,000 different creatures and the latest in advanced interactive technology, Aquaria KLCC stimulates your senses and open up your mind to the fascinating world under the sea.

Undersea Walkway (Underwater Tunnel)

Some of the highlights of the aquarium includes a 90 metre long underwater tunnel, the 10 foot long gigantic Arapamia, touch pool encounter along with the death-defying shark feedings at the Aqua Theatre.