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Embryonic Developmental Stages in Cultured Rabbitfish (Siganus guttatus, Bloch 1787)

Author Affiliations

  • 1 Department of Biological Sciences, College of Science and Mathematics, MSU-Iligan Institute of Technology, Iligan City;Xavier University-Ateneo de Cagayan, Cagayan de Oro City, PHILIPPINES

Int. Res. J. Biological Sci., Volume 1, Issue (8), Pages 65-70, December,10 (2012)

Abstract

In the Philippines, the rabbitfish (Siganus guttatus, Bloch, 1787) has significant aquaculture potential because of its high demand and increasing value. Studies on breeding and behavioural patterns including aspects on larval rearing and juvenile production are available for rabbitfishes. However, there are relatively few studies on the early development especially, on the description of eggs and embryonic development hence, this study was conducted. The present study describes the embryonic development of Siganus guttatus. It highlights the changing spectrum of developmental processes that occur under desirable conditions. The ripe egg diameter is around 550 m and egg colour is transparent and filled with fat globules. In this study the process of embryonic development was divided into five (5) periods: zygote, cleavage, blastula, gastrula and segmentation until it reached the larval stage. Asynchronous pattern of cleavage starts after the 32 cell stage and become progressively more variable in the later stages. The different stages that are recognizable for each period were documented and time lapsed of each embryonic development was recorded. This study will serve as baseline information for future studies on rabbitfishes, useful for optimization of large scale culture to enhanced captive production.

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