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A fish's hypoxia tolerance can be represented in different ways. A commonly used representation is the critical O 2 tension (P crit), which is the lowest water O 2 tension (P O 2) at which a fish can maintain a stable O 2 consumption rate (M O 2). [2]
Striated frogfish gather during the mating period but do not tolerate each other after fertilization. [6] This small fish grows up to 22 cm (8.7 in) long. Like other members of its family, it has a rounded, extensible body, and its soft skin is covered with irregularly-arranged dermal spinules resembling hairs. Its large mouth is forwardly ...
In fish, the long bony cover for the gill (the operculum) can be used for pushing water. Some fish pump water using the operculum. Without an operculum, other methods, such as ram ventilation, are required. Some species of sharks use this system. When they swim, water flows into the mouth and across the gills.
Breathing air is primarily of use to fish that inhabit shallow, seasonally variable waters where the water's oxygen concentration may seasonally decline. Fish dependent solely on dissolved oxygen, such as perch and cichlids , quickly suffocate, while air-breathers survive for much longer, in some cases in water that is little more than wet mud.
Because of their capability to use atmospheric oxygen, these fish generally are not so dependent on a form of aeration in their tanks, as they can rise to the surface of the water and take a breath, or breathing apparatus. Many of the labyrinth fish are peaceful and do well in most community tanks. However, individual males, especially the ...
The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ in bony fish (but not cartilaginous fish [1]) that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift via swimming, which expends more energy. [2]
The skin is scaleless, but covered with mucus, which protects the fish when it is out of water. Air-breathing organ of walking catfish This fish needs to be handled carefully when fishing it due to its embedded sting or thornlike defensive mechanism hidden behind its fins (including the middle ones before the tail fin, similar to the majority ...
The fins are used to propel streams of oxygenated water from the surface along the larva's body. The skin of the larva is thin and vascularised, allowing it to extract oxygen from this stream of water. As the fish grows, the adult air-breathing organ begins to develop, and it no longer requires the fins.