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Shoaling fish can shift into a disciplined and coordinated school, then shift back to an amorphous shoal within seconds. Such shifts are triggered by changes of activity from feeding, resting, travelling or avoiding predators. [4] When schooling fish stop to feed, they break ranks and become shoals. Shoals are more vulnerable to predator attack.
A fully mature individual harlequin rasbora attains a standard length of 4 cm～4.5 cm, the maximum length can reach two inches (5.1 cm). Males are cited as possessing a slightly larger black body patch than females, with the section adjoining the anal fin being more rounded in males. Ripe females are noticeably fuller in body outline.
[2] [3] An adult banded rainbowfish can reach a standard length of 12–15 cm with a deep body usually exceeding 1/3 of their body length. Like most other rainbowfish, this species varies in color depending on where they were collected, but all varieties have a distinct dark mid-lateral band and bright red/yellow dorsal , anal , and caudal fins.
Adults can grow up to 10.5 centimetres (4.1 in) at maximum length. [2] They have 12 dorsal spines, 14 to 15 dorsal soft rays, 2 anal spines, and 15 to 16 anal soft rays on their fins. [2] Coloration of this fish can change a lot. It depends on its behavior. [4] When it feeds, it turns silvery green. [4] It darkens when resting. [4]
Atlantic herring can school in immense numbers. Radakov estimated herring schools in the North Atlantic can occupy up to 4.8 cubic kilometres with fish densities between 0.5 and 1.0 fish/cubic metre, equivalent to several million fish in one school. [7] Herring are amongst the most spectacular schoolers ("obligate schoolers" under older ...
The eyespot rasbora is an elongate fish, with a pointed snout, whose base colour is a reflective, metallic silver, though under some lighting conditions, the fish can take on a yellowish hue, with a slight pink flush present in the ventral area of the body between the operculum and the pelvic fins (corresponding roughly to the sac enclosing the alimentary canal).
1. Add to Grains. Turn yesterday’s soup into today’s healthy bowl. Start with a base of grains like rice, farro, or quinoa. Add roasted veggies and a protein.
The tiger barb usually attains sexual maturity at a body length of 2 to 3 centimeters (0.79 to 1.18 inches) in total length, or at approximately six to seven weeks of age. The females are larger with a rounder belly and a mainly black dorsal fin, while the males have a bright, red nose with a distinct red line above the black on their dorsal fins.