Gonadal Development of the Primitive Flatfish <I>Psettodes erumei</I> in Kota Kinabalu, Sabah, Malaysia

Yoshikawa Naoki, Thamootharan Mammaran, Elvin Michael Bavoh, Abduhl Rhaman Ridzwan, Tanaka Masaru, Tagawa Masatomo

doi:10.11233/aquaculturesci.60.475

The primitive flatfish Psettodes erumei is an excellent species to study evolutionary mechanisms of asymmetrical metamorphosis, because it exhibits dimorphism in eye-sidedness. In this study, we collected basic information on the gonadal development to establish it as an experimental system. Specimens were purchased from November 2009 to October 2010 at a fish market in Kota Kinabalu, Malaysia. Specimens less than 30 cm standard length (SL) were almost exclusively males or had an undetermined sex, and those over 30 cm SL were females. Histologically, no premature ovarian tissues were found in testes, suggesting that the probability of sex change from male to female is low. Sperm were found in all testis-examined males (larger than 18.7 cm SL or a gonadosomatic index, GSI, over 0.1) collected from November to May. Males with GSI over 0.1 were present throughout the year. Oocyte development was asynchronous. Mature oocytes were found in females with a GSI over 6. Seasonal changes in GSI were not seen in females. These results indicate that artificial fertilization may be possible throughout the year, using wild fish 20-30 cm SL as mature males and wild fish larger than 30 cm SL with a GSI value >6 as candidate mature females.

Gonadal Development of the Primitive Flatfish <I>Psettodes erumei</I> in Kota Kinabalu, Sabah, Malaysia

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