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A fish ladder, also known as a fishway, fish pass, fish steps, or fish cannon, is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate diadromous fishes' natural migration as well as movements of potamodromous species. [1] Most fishways enable fish to pass around the barriers by swimming ...
Powdered fishmeal. Fish meal, sometimes spelt fishmeal, is a commercial product made from whole wild-caught fish, bycatch, and fish by-products to feed farm animals, e.g., pigs, poultry, and farmed fish. [1] Because it is calorically dense and cheap to produce, fishmeal has played a critical role in the growth of factory farms and the number of ...
Bubble nests, also called foam nests, are created by some fish and frog species as floating masses of bubbles blown with an oral secretion, saliva bubbles, and occasionally aquatic plants. Fish that build and guard bubble nests are known as aphrophils. [1] Aphrophils include gouramis (including Betta species) and the synbranchid eel Monopterus ...
Fish farming or pisciculture involves commercial breeding of fish, most often for food, in fish tanks or artificial enclosures such as fish ponds. It is a particular type of aquaculture, which is the controlled cultivation and harvesting of aquatic animals such as fish, crustaceans, molluscs and so on, in natural or pseudo-natural environments.
Oshimia D. S. Jordan, 1919. Pseudobetta Richter, 1981. Betta / ˈbɛtə / is a large genus of small, active, often colorful, freshwater ray-finned fishes, in the gourami family (Osphronemidae). [1] The best known Betta species is B. splendens, commonly known as the Siamese fighting fish and often kept as an aquarium pet.
The presence of mercury in fish is a health concern for people who eat them, especially for women who are or may become pregnant, nursing mothers, and young children. Fish and shellfish concentrate mercury in their bodies, often in the form of methylmercury, a highly toxic organomercury compound.
A fish hatchery is a place for artificial breeding, hatching, and rearing through the early life stages of animals—finfish and shellfish in particular. [1] Hatcheries produce larval and juvenile fish, shellfish, and crustaceans, primarily to support the aquaculture industry where they are transferred to on-growing systems, such as fish farms ...
Fish reproduction. A pair of bettas spawning under a bubble nest. Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused. [ 1 ] There may also be a range of secondary organs that increase reproductive fitness.