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The algae carp (Neocarassius alga) is a species of carp that originally did not exist, but has since been created by SciiFii and introduced throughout the lakes, rivers, and man-made waterways across mainland Eurasia, Great Britain, and Japan to help boost biodiversity. The closest living relative of the algae carp is the Crucian carp (Carassius carassius). The algae carp is a rather average-sized carp species, growing to be between 30-40 centimeters (11.8-15.7 inches) in length and weighing around 3.5 kilograms. The algae carp earns its name for its green coloration, which allows the species to blend in with the algae-choked waters in parts of its range. The algae carp is an adaptable species, able to thrive in both flowing and standing waters, freshwater and brackish waters. It is also exceptionally tolerant to low oxygen levels, pollution, and acidification. The algae carp is able to endure long winters by hibernating, and can survive completely frozen water by digging into the mud at the bottom of the water. During the hibernation, all of the body functions of the fish slow drastically, and the fish is able to survive during the hibernation without food and very little oxygen. The algae carp may spend up to 5 months in hibernation. The algae carp has a hump on its back to help it store food during the hibernation. The algae carp is an omnivorous filter-feeder and primarily feeds on plankton and bacteria, although it can occasionally feed on small invertebrates to supplement its diet. The gills of the algae carp are highly adapted structures that trap microscopic organisms. The algae carp counters the problems of low oxygen in the water by developing a simple lung to breathe air. Despite having extremely poor eyesight, the algae carp is able to sense danger with its sense of smell and the lateral line to detect. The algae carp also uses the lateral line to communicate with other members of its species. The algae carp has an ability to give birth to live young, and the young are born well-developed and are able to swim to the surface to take their first breath directly after birth, similarly to marine mammals. The algae carp is gregarious, but do not form shoals. The males court females during autumn, and the females give birth to 3-6 well-developed young during the spring. The algae carp reaches sexual maturity in 2-5 years, depending on the climate. The algae carp can live to be up to 70 years, especially in the colder climates. The conservation status of the algae carp is Least Concern due to successful conservation efforts, the algae carp's wide range and its tolerance to many of the human activities.