What kind of fish lay their eggs for rearing other fish, like cuckoos? Detailed answer

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What kind of fish lay their eggs for rearing other fish, like cuckoos? Detailed answer

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What kind of fish lay their eggs for rearing other fish, like cuckoos?

There are several types of fish that hatch fertilized eggs in their mouths. The fish Synodontis multipunctata, or cuckoo catfish, has learned to parasitize on this mechanism. Feeling the smell when its victims spawn, this catfish quickly swims up to them, eats part of the eggs and immediately spawns its own, and then the "foster mother" takes them into her mouth. Moreover, cuckoo catfish fry hatch earlier and eat the remaining native eggs.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Which spiders eat mostly plant foods?

All spiders known to biologists are predators. However, the diet of the Bagheera kiplingi species is 90% plant based. These spiders live on acacias and feed on belt bodies - special structures at the tips of leaves rich in lipids and proteins. Usually, belt corpuscles are included in the diet of ants, which "cultivate" them and protect the plant, and spiders simply steal them. Only during drought Bagheera kiplingi can turn to cannibalism, eating each other.

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Electrically conductive gel could help create flexible robots 14.04.2023

Engineers at Carnegie Mellon University have succeeded in combining polymers with liquid metal to develop an organogel composite that is ultra-flexible and highly conductive.

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To create a composite, the original polymer was immersed in a solvent to achieve plasticity. The resulting polymer base was then mixed with microscopic droplets of a liquid gallium-indium alloy and silver flakes. The end product was a low-density gel-like substance containing enough metal to transmit electricity.

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The main problem with most gel substances is their tendency to dry out, but the developers used ethylene glycol as the base, which has a negligible evaporation rate.

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