Joom!Fish 2.0 offers content localization (hiding non-translated content items), however in order this to function correctly with JoomSEF, a small add of code should be made on line 375 of components/com_sef/joomsef.php (straight after "$registry =& JFactory::getConfig();")
// Attention - we need to access the original config for the default values
$origConfig = new JFrameworkConfig();
$registry->setValue("config.defaultlang", $origConfig->language);
unset($origConfig);
The issue was discovered in our private forums and resolved by Geraint Edwards, so I can not point out the thread.
Regards,
Ivo Apostolov
Joom!Fish Team