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Red represents a higher value (e.g. of temperature or the partial pressure of a gas) than blue so the property being transported in the channels flows from red to blue. In fish a countercurrent flow (lower diagram) of blood and water in the gills is used to extract oxygen from the environment. [6] [7] [8] All basal vertebrates breathe with gills.
An endotherm (from Greek ἔνδον endon "within" and θέρμη thermē "heat") is an organism that maintains its body at a metabolically favorable temperature, largely by the use of heat released by its internal bodily functions instead of relying almost purely on ambient heat.
The opah is the only fish known to exhibit whole body endothermy where all the internal organs are kept at a higher temperature than the surrounding water. [3] This feature allows opahs to maintain an active lifestyle in the cold waters they inhabit. [5]
In fact, tuna can maintain the temperature of their muscles at 5–20 °C (9–36 °F) above the temperature of surrounding water. [31] Overall, tuna do not have a set body temperature point; rather it maintains its T B within a narrow range, with variations of only 4–5 °C (7–9 °F) over time and from individual to individual. [31] [32]
Consistent temperatures at or above 35 °C (95 °F) are typically lethal, while growth stops when temperatures are at or below 10 °C (50 °F). [13] For male mosquitofish, sexual maturity is reached in about 43 to 62 days, but maturation age is also dependent on temperature and resources. [37]
Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when the surrounding temperature is very different. A thermoconforming organism, by contrast, simply adopts the surrounding temperature as its own body temperature, thus avoiding the need for internal thermoregulation.
The popularity of such raw fish dishes makes it important for consumers to be aware of this risk. Raw fish should be frozen to an internal temperature of −20 °C (−4 °F) for at least seven days to kill parasites. It is important to be aware that home freezers may not be cold enough to kill parasites. [67] [68]
Its temperature range is 10–25 °C (50–77 °F). [4] ... internal temperature of the fish's abdomen, ambient water temperature, and depth. [14] ...