Investigations on krill (Euphausiacea) sampled during the Norwegian Antarctic Research Expedition 1976-77
Fevolden, S.-E. (1979). Investigations on krill (Euphausiacea) sampled during the Norwegian Antarctic Research Expedition 1976-77. Sarsia 64(3): 189-198
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827; e-ISSN 1503-1128, more
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| Keywords |
Fisheries > Shellfish fisheries > Crustacean fisheries > Krill fisheries
Euphausia crystallorophias Holt & Tattersall, 1906 [WoRMS]; Euphausia frigida Hansen, 1911 [WoRMS]; Euphausia superba Dana, 1850 [WoRMS]; Euphausia triacantha Holt & Tattersall, 1906 [WoRMS]; Euphausiacea [WoRMS]; Thysanoessa macrura G.O. Sars, 1883 [WoRMS]
PSW, Weddell Sea [Marine Regions]
Marine/Coastal |
| Abstract |
Krill was sampled in the Weddell Sea, farther south than ever before, and off Bouvetoya. Five species were found: Euphausia superba, E. crystallorophias, E. frigida, E. triacantha , and Thysanoessa macrura. E. superba and E. crystallorophias were the most abundant species north and south of 74°S respectively. Length frequency analyses suggest that E. superba from the inner Weddell Sea takes 3 yr to reach maturity. This population differed in several aspects from the populations farther north. E. crystallorophias and T. macrura were registered south to 77°45'S, the southernmost localisation investigated. The material gives no clear evidence whether these species take one or 2 yr to reach maturity. Their spawning activity seems to start earlier in the season than for E. superba. E. frigida and E. triacantha were only found off Bouvetoya. Continuous echosounder recordings revealed that the total abundance of krill in the southern parts of the Weddell Sea was low, as was also the abundance on the route between the South Orkney Islands and Dronning Maud Land. |
| Dataset |
- Antarctic Euphausiacea occurence data from Norwegian Antarctic Research Expedition 1976-77, more
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