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Fingerling – refers to a fish that has reached the stage where the fins can be extended and protective scales have covered the body. [4] At this stage, the fish is typically about the size of a human finger, [5] hence the name. Once reaching this stage, the fish can be considered a juvenile, and is usually active enough to move around a large ...
Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies, mollies, platies and swordtails. [ 1 ] The advantages of livebearing to the aquarist are that the newborn juvenile fish are larger than newly-hatched fry, have a lower chance of mortality and are easier to care for.
The location of the brood pouch can be along the entire underside of the pipefish or just at the base of the tail, as with seahorses. [49] Pipefish in the genus Syngnathus have a brood pouch with a ventral seam that can completely cover all of their eggs when sealed. In males without these pouches, eggs adhere to a strip of soft skin on the ...
Some species gather up fertilized eggs in their mouth and keep them safe until they hatch, a process called mouthbrooding.. Cichlid.In addition to being mouthbrooders, some species continue to protect their young after they hatch, calling out to them when there is danger, and letting them swim back into their mouth to hold them safely away.
The fish family Syngnathidae has the unique characteristic of a highly derived form of male brood care referred to as "male pregnancy". [2] The family is highly diverse, containing around 300 different species of fish. Included in Syngnathidae are seahorses, the pipefish, and the weedy and leafy seadragons.
In fish, this often refers to the presence or absence of a stomach: precocial larvae have one at the onset of first feeding whereas altricial fish do not. [1] Depending on the species, the larvae may develop a functional stomach during metamorphosis (gastric) or remain stomachless (agastric).
Marine fish can produce high numbers of eggs which are often released into the open water column. The eggs have an average diameter of 1 millimetre (0.039 in). The eggs are generally surrounded by the extraembryonic membranes but do not develop a shell, hard or soft, around these membranes. Some fish have thick, leathery coats, especially if ...
A baby has to be able to hold his or her head up (usually at 3 to 4 months), to be ready for swimming lessons. [15] Children can be taught, through a series of "prompts and procedures," to float on their backs to breathe, and then to flip over and swim toward a wall or other safe area.