Description: Physical oceanography variables and carbon flux (for juveniles/adults of dominant mesopelagic migratory species) were determined during the CAPEGOLCA XIII and CAPEGOLCA XIV cruises (June-October 2018). This dataset contains the depth, temperature, and conductivity that were recorded with a Star-ODDI CTD attached to a Bongo net during CAPEGOLCA XIII and with a SeaBird SB11 CTD attached to an oceanographic rosette in CAPEGOLCA XIV. Values of numerical abundance, migrant biomass, specific respiration and respiration flux data for each individual of fishes, decapods and large euphausiids analyzed at the north-central regions in the Gulf of California are given. Specimens were collected during the nighttime (20:00–05:00 h local) using a standard Bongo net (0.61 m mouth diameter, 505 µm mesh net). The integrated layer from maximum depth to surface (32–272 m) was evaluated through oblique hauls for each cruise. Collected specimens were identified on board to the lowest possible taxonomic level and those selected for electron transfer system (ETS) activity analysis were immediately frozen in liquid nitrogen contained for posterior chemical analyses in the land-based laboratory. Values of abundance, migrant biomass, specific respiration and respiration flux were integrated from sampling depth to surface.

Description: Depth, temperature, and conductivity were recorded with a Star-ODDI CTD attached to a Bongo net during CAPEGOLCA XIII and half of CAPEGOLCA XIV (stations 36–101), and additionally with a calibrated SeaBird SB11 CTD attached to an oceanographic rosette for stations 4–95 during CAPEGOLCA XIV in October 2018.

Description: The values of carbon flux were determined in juveniles/adults of 3 species of migratory mesopelagic fishes, 2 species of decapods and 2 species of large euphausiids sampled during the CAPEGOLCA XIII and CAPEGOLCA XIV cruises (June-October 2018). This dataset contains the values of numerical abundance, migrant biomass, specific respiration and respiration flux data for each individual analyzed at the north-central regions in the Gulf of California. Specimens were collected during the nighttime (20:00–05:00 h local) using a standard Bongo net (0.61 m mouth diameter, 505 µm mesh net). The integrated layer from maximum depth to surface (32–272 m) was evaluated through oblique hauls for each cruise. Collected specimens were identified on board to the lowest possible taxonomic level and those selected for electron transfer system (ETS) activity analysis were immediately frozen in liquid nitrogen contained for posterior chemical analyses in the land-based laboratory. Values of abundance, migrant biomass, specific respiration and respiration flux were integrated from sampling depth to surface.

Description: Depth, temperature, and conductivity were recorded during the Bathypelagic cruise (from 24th May to 23rd June 2018,) using a SeaBird SBE 25plus CTD, the dissolved oxygen with a Seabird-43 sensor both attached to an oceanographic rosette from surface to a maximum depth of 2000 m, and the fluorometer with a Seapoint sensor in the upper 200 m depth.

Description: The values of carbon remineralisation were measured in juveniles/adults of 5 non-migratory bristlemouth fishes (Cyclothone spp.) and partial migrator (Argyropelecus hemigymnus) sampled during the BATHYPELAGIC cruise (North Atlantic, June 2018). This dataset contains the values of numerical abundance, biomass, specific ETS activity, specific respiraton and respiration flux data analyzed from Northwest Africa (20° N, 20° W) to the South of Iceland. A. hemigymnus specimens were collected using a ''Mesopelagos” net (5 x7 m mouth opening, 58 m total length) equipped with graded-mesh netting (starting with 30 mm and ending with 4 mm) and a multi-sampler for collecting samples from 5 different depth layers (Olivar et al., 2017). However, Cyclothone specimens were collected using the Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS-1 m²) zooplankton net (Wiebe et al., 1985) with a 0.2 mm mesh size and with several nets for collecting samples from 8 different depth layers. The Mesopelagos catches were sorted out and identified on board to the lowest possible taxon, and specimens selected for Electron Transfer System (ETS) analyses were immediately frozen in liquid nitrogen for later analysis in the laboratory. MOCNESS samples were preserved in 5% buffered formalin, and specimens were sorted out later in the laboratory. Stomiiforms respiration in the meso- and bathypelagic zones of the ocean were estimated along the transect. Abundance, biomass, specific ETS activity, specific respiration and respiration are given by layer.

Description: Physical oceanography variables and carbon remineralisation (juveniles/adults of Cyclothone species and Argyropelecus hemigymnus) were analysed during the BATHYPELAGIC cruise (North Atlantic, June 2018). This dataset contains the depth, temperature, and conductivity which were recorded from surface to a maximum depth of 2000 m using a SeaBird SBE 25plus CTD equipped with a Seabird-43 Dissolved Oxygen sensor and a Seapoint Fluorometer. Values of numerical abundance, biomass, specific ETS activity, specific respiraton and respiration flux data analyzed from Northwest Africa (20° N, 20° W) to the South of Iceland are presented. A. hemigymnus specimens were collected using a ''Mesopelagos” net (5 x7 m mouth opening, 58 m total length) equipped with graded-mesh netting (starting with 30 mm and ending with 4 mm) and a multi-sampler for collecting samples from 5 different depth layers. However, Cyclothone specimens were collected using the Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS-1 m²) zooplankton net with a 0.2 mm mesh size and with several nets for collecting samples from 8 different depth layers. The Mesopelagos catches were sorted out and identified on board to the lowest possible taxon, and specimens selected for Electron Transfer System (ETS) analyses were immediately frozen in liquid nitrogen for later analysis in the laboratory. MOCNESS samples were preserved in 5% buffered formalin, and specimens were sorted out later in the laboratory. Stomiiforms respiration in the meso- and bathypelagic zones of the ocean were estimated along the transect. Abundance, biomass, specific ETS activity, specific respiration and respiration are given by layer between e.g. 100 m and 1000 m depth (MOCNESS net, 1900–1600 m, 1600–1300 m, 1300–1000 m, 1000–700 m, 700–400 m, 400–200 m, 200–100 m and 100–0 m; Mesopelagos, 1900–1200 m, 1200–800 m, 800–500 m, 500–200 m and 200–0 m).