Definition of mesopelagic in English:

mesopelagic

adjective

Biology
  • (of fish and other organisms) inhabiting the intermediate depths of the sea, between about 200 and 1,000 metres (approximately 650 and 3,300 ft) down.

    ‘many mesopelagic fish species have swim bladders’
    • ‘Similar events occur in the eyes of mesopelagic shrimps, such as the oplophorids.’
    • ‘Tooth morphology in this selection of mesopelagic fishes is quite diverse suggesting that their feeding strategies might be diverse as well.’
    • ‘Our results indicate that mesopelagic fish pose a stronger predatory threat than invertebrates to overwintering Calanus.’
    • ‘Extensive survey data show that the max values of visual pigments of mesopelagic marine fishes are more blue-shifted than those of shallow-water species.’
    • ‘Rhadinesthes decimus is known primarily as a mesopelagic ocean fish living at depths around 500 m.’
    • ‘Most current knowledge applies to coastal species with benthic adult stages, and it would be exciting (though challenging) to see this work extended to larvae of mesopelagic or deep-sea species.’
    • ‘Most mesopelagic species are either red or black and most deep-sea benthic species range from pale yellow to red.’
    • ‘As our understanding of large marine predators increases, the critical role of concentrations of mesopelagic cephalopods in the lives of such species as elephant seals, billfishes and tuna is becoming clear.’
    • ‘Indeed, the presence of bioluminescence explains several otherwise paradoxical characteristics of mesopelagic body coloration.’
    • ‘These species undergo large changes in depth, many traveling from mesopelagic depths to the surface in the evening and then descending before dawn.’
    • ‘Neutrally buoyant ammoniacal cephalopods in the mesopelagic are a limiting case in need of study.’
    • ‘Unfortunately measurements of absorption and scattering coefficients at mesopelagic depths in oceanic waters do not exist.’
    • ‘The temporal resolutions of the dark-adapted photoreceptors of several species of mesopelagic crustaceans have been described in earlier studies.’
    • ‘The assemblage is characterized by the co-occurrence of epipelagic, mesopelagic and benthopelagic taxa together with neritic taxa.’
    • ‘Indeed, a large number of mesopelagic animals have eyes that permanently view the upward direction for just this reason.’
    • ‘Because the spectra at mesopelagic depths are quite narrow, light at wavelengths longer or shorter than the wavelength of peak transmission contributes very little to visibility.’
    • ‘This suggests that directed bioluminescence and the transmission of bioluminescence through gut walls are more important than ambient light for detecting animals at mesopelagic depths.’
    • ‘For example, pilot whales had smaller group sizes when they fed more on mesopelagic fish and less on mesopelagic cephalopods, and common dolphins had larger groups if they fed on varying types of fish.’
    • ‘Additional comments are made below regarding the distribution of epipelagic, mesopelagic, and benthopelagic elasmobranchs and teleosts in the upwelling assemblages.’
    • ‘Indeed, many of the mesopelagic species range far eastward with the Gulf Stream, outside our area and into the eastern Atlantic.’

Pronunciation

mesopelagic

/ˌmɛzə(ʊ)pɪˈladʒɪk//ˌmiːsə(ʊ)pɪˈladʒɪk//ˌmɛsə(ʊ)pɪˈladʒɪk//ˌmiːzə(ʊ)pɪˈladʒɪk/