Ichthyological terms, not general ones.
Length of flexible cable buried under the substrate in an aquarium and used to maintain constant water temperature. Also popular in planted aquaria due to the associated circulation of water within the substrate which aids in nutrient exchange between plant roots and the surrounding environment.
Thermostatically-controlled device used to maintain constant water temperature in an aquarium or pond, also known as a heaterstat. Depending on design, may be installed submersed within the aquarium, sump or substrate (see heating cable) or inline with tubing attached to an external filter. Some types of the latter also have a heating element built in.
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