Marine Biology

, Volume 143, Issue 6, pp 1095–1107 | Cite as

Effect of temperature on growth, sexual maturity and reproduction of Acanthomysis robusta (Crustacea: Mysidacea) reared in the laboratory

Research Article


The growth, sexual maturity and reproduction of a shallow, temperate-water mysid, Acanthomysis robusta Murano, were investigated by rearing this species through a complete life cycle at 10°C, 15°C, 20°C and 25°C. The average daily growth rate, which ranged from 0.08 to 0.29 mm for immature mysids and from 0.04 to 0.15 mm for mature mysids, increased with increasing temperature. Water temperature had little effect on the molt increment (the increase in body length between successive molts), but clearly shortened the intermolt period (the interval between successive molts) with increasing temperature. Thus, the faster growth rate at higher temperatures is responsible for the shortened intermolt period. External sexual differentiation first became apparent at the 4th or 5th post-marsupial molt, when body length was 4.3–4.9 mm. Thereafter, males reached sexual maturity at the 9th or 10th post-marsupial molt (7.3–9.8 mm in body length), while females reached maturity at the 10th–13th molt (8.2–12.2 mm). In contrast to this small difference in molt number for sexual maturity, the post-marsupial age at first maturity, which ranged from 13 to 57 days for males and from 17 to 78 days for females, decreased markedly with increasing temperature. The incubation time of ovigerous females, which varied from 5 to 24 days, also decreased with increasing temperature. The relationships between water temperature and the three development times, the intermolt period, the age at first sexual maturity and the incubation time conformed to the effective day-degree concept. Although mature females maximally produced four broods in a lifetime, egg-bearing significantly lengthened the intermolt period and consequently functioned as a factor decreasing the growth rate.


Body Length Sexual Maturity Ovigerous Female Maximum Life Span Piecewise Linear Regression 
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I thank H. Yamada for his valuable advice on culture methods; N. Kajihara for providing equipment for culture; M. Noguchi and T. Fujii for their assistance with the field collections; S. Toda for his help with the data analyses; and T. Okumura and N. Iguchi for their valuable discussions on the molting and reproduction of crustaceans. This work was supported in part by a grant (BCP) from the Ministry of Agriculture, Forestry and Fisheries. This is contribution no. B-9913 from Japan Sea National Fisheries Research Institute. The experiments comply with the current laws of Japan.


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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Japan Sea National Fisheries Research InstituteFisheries Research AgencyNiigataJapan

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