Publication Date:
2024-01-06
Description:
Knowledge on life history traits of mesopelagic fishes is still sparse. This dataset contains reproductive data of the myctophid Electrona risso (Cocco, 1829) and the melamphaids Melamphaes polylepis Ebeling, 1962 and Scopelogadus mizolepis (Günther, 1878). The specimens were collected in March and April 2015 during cruise 383 of the fishery research vessel "FFS Walther Herwig III" in the Eastern Central Atlantic. A pelagic midwater trawl ("Aalnet", Engel Netze, Bremerhaven Germany) with multiple opening-closing device with three net bags of 20 mm mesh size and 1.8 mm mesh size in the cod-end container was used for catching fish at three depth strata per station between 50 and 700 m depth. Fish was stored in phosphate buffered 4% formalin solution and later on land in laboratories, specimens were measured, weighed, and dissected to examine gonads and oocytes under a stereo microscope. Reproductive phases were assigned based on macroscopic inspection following the standardised terminology for reproductive development in fish by Brown-Peterson et al. (2011, doi:10.1080/19425120.2011.555724). Histological cross sections of selected individuals were used for validation. The Gonadosomatic Index was calculated as GSI = 100 x gonad mass / (total mass – gonad mass). Batch fecundities were determined with the gravimetric method, counting the most advanced eggs in weighed subsamples.
Keywords:
According to Brown-Peterson et al. (2011); Batch fecundity; DATE/TIME; Depth, water, bottom/maximum; Depth, water, top/minimum; Eastern Central Atlantic Ocean; Event label; Field-collected organisms; Fish, standard length; Fish, total length; Fish, wet mass; Fish eggs; Gonad, mass; Gonadosomatic index; Gravimetric method, counting hydrated eggs according to Hunter et al. (1985, NOAA Technical Report NMFS, 36, 67-77); GSI; LATITUDE; LONGITUDE; Macroscopic inspection of gonad according to Brown-Peterson et al. (2011); Maturity; Maturity score; Measured using callipers; mesopelagic fish; Midwater trawl; MWT; Oocyte, diameter; oocyte size; Reproductive phase; Sample ID; Sampling; Sex; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Stereo Microscope; Walther Herwig III; WH383; WH383_306-74; WH383_309-78; WH383_311-90; WH383_315-04; WH383_318-87; WH383_321-90; WH383_324-93; WH383_327-96; WH383_330-99; WH383_333-102; WH383_337-106; WH383_340-109; WH383_344-113; WH383_349-118; WH383_352-121
Type:
Dataset
Format:
text/tab-separated-values, 22329 data points
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