1. The largest marine shrimp in the world - American Crayfish

American Crayfish is also known as Boston Lobster. It is distributed on the coast of North America in the Atlantic Ocean, including Canada, Newfoundland, Labrador, Maine and Massachusetts in the United States. The largest American crayfish was caught off the coast of Nova Scotia, Canada in 1997, weighing 20.14 kilograms. The length is 1.06 meters. American crayfish mainly feed on fish and shellfish.

Life habits of American crayfish

American crayfish are usually brown-green and olive-green, and also have reddish-brown and black. Blue and yellow are rare, and Asian lobsters The difference is that the first step is a pair of large claws with a smooth surface and thin antennae.

It likes to live in shallow seas and gravel holes, feeding on small fish, shellfish, and crabs. Its natural enemies are other lobsters and flounder.

2. The world's largest freshwater shrimp - Macrobrachium rosenbergii

Macrobrachium rosenbergii is a freshwater long-armed prawn, also known as Macrobrachium rosenbergii, big-headed shrimp, and marsh Blue shrimp is one of the largest freshwater shrimps in the world. Macrobrachium rosenbergii is widely distributed and originates from India, Vietnam, Thailand, Myanmar, Malaysia, etc.

The living environment of Macrobrachium rosenbergii

Macrobrachium rosenbergii lives in fresh water from juvenile to adult stages. Mature broodstock mate and lay eggs in fresh water. Seedlings are laid out in salt water and the larvae develop in salt water. Macrobrachium rosenbergii has high requirements for the dissolved oxygen content in the water and is not tolerant to fertilized water. It generally requires the dissolved oxygen content to be above 5 mg/L. The concentration of dissolved oxygen has a great impact on the feeding growth and feed efficiency of the shrimp, especially in the middle and late stages of breeding. Change the water and keep the water transparency between 35 and 40 centimeters.

Macrobrachium rosenbergii is huge, with adults usually less than 25 centimeters in length, and the darker the water, the larger it becomes. Currently, the largest known Macrobrachium rosenbergii is 110 centimeters long and weighs 600 grams.