Effect of temperature on embryo development time and hatching success of the Antarctic krill Euphausia superba Dana in the laboratory

Authors: Yoshida T.¹; Toda T.¹; Hirano Y.²; Matsuda T.²; Kawaguchi S.³

Source: Marine and Freshwater Behaviour and Physiology, Volume 37, Number 2, June 2004 , pp. 137-145(9)

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Abstract:

Embryos released by gravid females of Antarctic krill (Euphausia superba Dana) at the Port of Nagoya Public Aquarium, Japan were incubated in the laboratory to determine the development time and hatching success of embryos at -2.1, -1.7, -1.2, -0.6, -0.1, 0.8 and 2.4°C. Embryo development time was significantly related to temperature, and could be expressed either in an exponential model or B ecaron

léhradek's equation.

The B

léhradek's equation was compared with previous studies, and also with those on other marine crustaceans. The curve calculated by this equation was similar to those for other arctic zooplankton species. Hatching success ranged from 7 to 58%, and varied between each gravid female. The physical condition of gravid females may affect the embryo quality and the hatching success.

The factors that determine embryo development time and hatching success are discussed by comparing the data with those from previous studies performed on euphausiids and other marine crustaceans.

Keywords: Krill; Euphausia superba; Hatching success; Embryo development; Temperature; B ecaron léhradek's equation

Document Type: Research article

DOI: http://dx.doi.org/10.1080/10236240410001705789

Affiliations: 1: Department of Environmental Engineering for Symbiosis Faculty of Engineering Soka University 1-236 Tangi-cho Hachioji Tokyo 192-8577 Japan 2: Port of Nagoya Public Aquarium 1-3 Minato-machi Minato-ku Nagoya 455-0033 Japan 3: National Research Institute of Far Seas Fisheries 5-7-1, Shimizu Orido Shizuoka 424-8633 Japan

Publication date: 2004-06-01