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The basic functions of communication in aquatic animals are similar to those of terrestrial animals. In general, communication can be used to facilitate social recognition and aggregation, to locate, attract and evaluate mating partners and to engage in territorial or mating disputes. Different species of aquatic animals can sometimes communicate.
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In addition to camouflage and appearing larger in the face of a threat, squids use color, patterns, and flashing to communicate with one another in various courtship rituals. Caribbean reef squid can send one message via color patterns to a squid on their right, while they send another message to a squid on their left. [9] [10]
Squid are capable of rapid changes in skin color and pattern through nervous system control of chromatophores. [38] In addition to camouflage and appearing larger in the face of a threat, squid use color, patterns, and flashing to communicate with one another in various courtship rituals. Caribbean reef squid can send one message via color ...
Another squid, Abralia trigonura, is able to produce three spectral components: at 440 and at 536 nanometres (green), appearing at 25 Celsius, apparently from the same photophores; and at 470–480 nanometres (blue-green), easily the strongest component at 6 Celsius, apparently from a different group of photophores. Many species can in addition ...
Squids are the primary sufferers of negative buoyancy in cephalopods. The negative buoyancy means that some squids, especially those whose habitat depths are rather shallow, have to actively regulate their vertical positions. This means that they must expend energy, often through jetting or undulations, in order to maintain the same depth.
The bigfin reef squid is the first squid species to have been cultured for more than one generation. It is remarkable for its ability to readily adapt to being confined in tanks, [ 31 ] [ 53 ] and is one of the few squid species of which the entire life span has been observed under laboratory conditions.
Squid swim more slowly than fish, but use more power to generate their speed. The loss in efficiency is due to the amount of water the squid can accelerate out of its mantle cavity. [18] Jellyfish use a one-way water cavity design which generates a phase of continuous cycles of jet-propulsion followed by a rest phase. The Froude efficiency is ...