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Reproductive biology and intra marsupial development of mysids in Auckland region, New Zealand

Author Affiliations

  • 1Department of Zoology, The Open University of Sri Lanka, Nawala, Nugegoda, Sri Lanka

Int. Res. J. Environment Sci., Volume 7, Issue (9), Pages 28-35, September,22 (2018)

Abstract

Tenagomysis chiltoni and T. novaezealandiae collected from selected estuarine sites showed continuous breeding. In both species breeding is continuous. Reproductive potential of T. chiltoni is highest during winter to early summer, with major peaks during spring while T. novaezealandiae was more inconsistence in seasonal variation. Length of mysids and brood size varies with the season, being maximum during cooler months. The occurrence of the highest body size and brood size in spring may be due to favourable conditions prevailing in moderate temperatures. The larger species showed higher brood size and higher egg diameters than smaller species. Laboratory studies showed that, intra marsupial development period and each developmental stage of T. chiltoni, last longer than that of T. novaezealandiae. In both species, egg stage is shorter than other stages. All stages of larvae of T. chiltoni are larger than those of T. novaezealandiae. The total development time for T. chiltoni was, 19-20 days,T. novaezealandiae it was 17-18 days. The gravid females of T. chiltoni are negatively correlated with salinity, indicating that the higher salinity levels provide unsuitable conditions and the opposite is true for T. novaezealandiae. Except juveniles, all the life stages of T. novaezealandiae showed positive correlation with temperature, indicating that high temperatures provide better conditions for T. novaezealandiae than T. chiltoni.

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