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Vision is an important sensory system for most species of fish. Fish eyes are similar to those of terrestrial vertebrates like birds and mammals, but have a more spherical lens. Their retinas generally have both rod cells and cone cells (for scotopic and photopic vision), and most species have colour vision.
The FBISE was established under the FBISE Act 1975. [2] It is an autonomous body of working under the Ministry of Federal Education and Professional Training. [3] The official website of FBISE was launched on June 7, 2001, and was inaugurated by Mrs. Zobaida Jalal, the Minister for Education [4] The first-ever online result of FBISE was announced on 18 August 2001. [5]
Conversely, freshwater has less osmolytes than the fish's internal fluids. Therefore, freshwater fishes must utilize their gill ionocytes to attain ions from their environment to maintain optimal blood osmolarity. [6] [10] In some primitive bony fishes and amphibians, the larvae bear external gills, branching off from the gill arches. [11]
Aquatic respiration. Sea slugs respire through a gill (or ctenidium) Aquatic respiration is the process whereby an aquatic organism exchanges respiratory gases with water, obtaining oxygen from oxygen dissolved in water and excreting carbon dioxide and some other metabolic waste products into the water.
These fish are best kept with live or frozen feed and they easily outgrow the tank within eight to ten months. An aquarium with the minimum diameter of 6 by 3.5 feet (1.8 by 1.1 m) and 300 US gallons (1,100 L; 250 imp gal) is suggested as a bare minimum but 400–800 US gallons (1,500–3,000 L; 330–670 imp gal) is the best way to go. [ 9 ]
Cirrhitidae hawkfishes are roughly oblong in shape [6] with a body which has a depth which is 21% to 50% of its standard length. [7] They have a fringe of cirri on the rear edge of the forward nostrils. There are two poorly developed spines, on the gill cover. The outer row of teeth on the jaws are canine-like, the longest normally being ...
Description. The black swallower is a small fish, averaging between 15 cm to 20 cm (6 to 8 in), [4] with a maximum known length of 25 cm (9.8 in). [3] The body is elongated and compressed, without scales, and is a uniform brownish-black in color. Its head is long, with a blunt snout, moderately sized eyes, and a large mouth.
Coho salmon. The coho salmon (Oncorhynchus kisutch; Karuk: achvuun [1]) is a species of anadromous fish in the salmon family and one of the five Pacific salmon species. Coho salmon are also known as silver salmon (or "silvers") and is often sold as medium red salmon. [2] The scientific species name is based on the Russian common name kizhuch ...