Main characteristics of arrowworms in the Bering Sea (species composition, distribution, biomass, production)

• Published in: Izvestiya TINRO
• Main Author: К. M. Gorbatenko
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: Transactions of the Pacific Research Institute of Fisheries and Oceanography 2021
• Subjects: берингово море; щетинкочелюстные; распределение; биомасса; продукция; chaetognatha; parasagitta elegan; Aquaculture. Fisheries. Angling; SH1-691; Bering Sea; Берингов*
• Online Access: https://doi.org/10.26428/1606-9919-2021-201-416-424; https://doaj.org/article/d91a7d811134467687565bbb910c131d

Zooplankton was sampled from the epipelagic layer (0–200 m) in the Bering Sea using Jedae net (mouth 0.1 m2, mesh size 0.168 mm) in 1986–2018. Arrowworms were the most numerous predators, represented with 3 species: Parasagitta elegans, Eukrohnia hamata, and Pseudosagitta maxima. Their summary biomass was 215.7 mg/m3, on average (26.3 % of the total zooplankton biomass), and varied seasonally from 105.9 mg/m3 in winter to 311.8 mg/m3 in autumn. Parasagitta elegans dominated absolutely (> 99 % WW). Mean stock of this species was 64.36. 106 t; its seasonal yield was estimated as 22.1. 106 t in winter, 78.5. 106 t in spring, 191.9. 106 t in summer, and 130.3. 106 t in autumn, so its mean production was 422.8. 106 t WW per year.