Japan Sea Stickleback (IMAGE) Research Organization of Information and Systems Caption A Japan Sea male stickleback. They cannot colonize freshwater because they have a poor ability to synthesize DHA. Credit Yasuyuki Hata Usage Restrictions Only for use with reports of this research. Contact us before use. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.