The Sedili site is nearly the only site which remained for P. alfredi from several small sites formerly, most of them were situated at the old road from Mawai to Desaru in the Johore province of Kota Tinggi. Google maps show a momentum some years ago when there was very high water indeed; that had changed some weeks after already. The actual site visited by Prof. Beyer was a rather small area not to be identified properly by that outdated map.
The changing water-level may have heavy effects on the fish populations, good and bad. Beyer who was over there not for the first time will surely visit the site at his next opportunity, and there maybe a changed situation as P. alfredi is regarded. Either to the better or to the worse. But according to his report the later is most likely. Obviously, heavy building is going on over there presently, and the connections to the small remaining isles of former rainforest with the former peat swamps is obviously blocked on many places. This does not leave much hopes.
But we have Asian members living in Singapore or nearby. Please, look and tell us the present situation!
Fundamentally, it is advisable to go for fishing at low-water times. In high waters you are rarely lucky to find what you are searching for. Again: Our local friends, please tell us how things develop and the remaining formemost alfredi-site can be located properly again!
We know the coordinates of of two small sites: 1) 01° 51′ 23 N, 104° 03′ 54 E, and 2) 01° 50′ 02 N, 104° 04′ 26 E.