The seasonal variations in glacier lanternfish (Benthosema glaciale) vertical distribution and diel vertical migration (DVM) were studied by use of a bottom-mounted upward-facing 38 kHz echo sounder deployed at 392 m depth and cabled to shore in Masfjorden (~60°52'N, ~5°24'E), Norway. Acoustic data from July 2007-October 2008 were analyzed, and scattering layers below ~220 m during daytime were...

For many mesopelagic fishes, even basic knowledge regarding their biology is missing, greatly impeding effective management. Here we present length–weight relations for 16 fishes sampled during research surveys in the Greek seas (eastern Mediterranean). The following species were studied: Benthosema glaciale (Reinhardt, 1837); Ceratoscopelus maderensis (Lowe, 1839); Diaphus holti Tåning, 1918; ...

Though mesopelagic fish respond to natural light (e.g., diurnal vertical migration), few studies have looked at how they artificial and if lights could be used in commercial operations improve catchability of fish. Here we present a preliminary study on organisms blue green spotlights, as well red white diffuse Masfjorden (Norway; max depth 480 m). The response each the three sound scattering l...

The behavior of the mesopelagic fish Benthosema glaciale was studied at 60°N in mid-summer. We hypothesized that diel vertical migration (DVM) is constrained by short and dusk nights (surface illumination > 10−2 μmol m−2 s−1) individuals are active depth during long summer days. Submerged echosounders provided high-resolution data throughout water column. During day, a part population ascended ...

DNA barcode sequences were developed from 557 mesopelagic and upper bathypelagic teleost specimens collected in waters off Atlantic Canada. Confident morphological identifications were available for 366 specimens, of 118 species and 93 genera, which yielded 328 haplotypes. Five of the species were novel to the Barcode of Life Database (BOLD). Most of the 118 species conformed to expectations of...

Vertical migrations into shallower waters at night are beneficial for migrators as they reduce predation risk and allow to encounter a higher density of prey. Nevertheless, ocean acoustics data trawl have shown that portion some vertically migrating populations remain depth do not migrate. One hypothesis this phenomenon is the Hunger-Satiation hypothesis, which in part states non-migrating spec...

The morphological characteristics of the eyes and the retinae of lanternfish larvae of Lampanyctus crocodilus, Benthosema glaciale, and Myctophum punctatum were analyzed in pre-flexion, flexion, and post-flexion stages. Pre-flexion larvae of L. crocodilus, the species with the shallowest depth distribution, had spherical eyes located antero-laterally on a strongly laterally-compressed head, sug...