Further studies in my research for the relation of carbon dioxide and peat swamp had lead me to more datas confirming this anomaly. Peat swamp or Black waters indeed are starved of oxygen and contains high level of Carbon Dioxide as I've suspected all this while. We take a look at the work of Dina Muthmainnah and Zulkifli Dahlan for the research paper of Biodiversity of lebak deling swamp in Pampangan Indonesia. http://www.innspub.net/wp-content/uploads/2015/06/JBES-Vol6No6-p324-333.pdf In their research they have tested the black waters from multiple points and the water parameter shown below is of similarity from those that which I did with simple testing, not as sophisticated as I lacked the equipment in doing so The important aspect here is that it confirms that Black waters are indeed low in oxygen and abnormally high in carbon dioxide (CO2). The PH is similar at 4.5PH average and TDS an average of 24PPM which I recorded an average of 25PPM at Terengganu swamp.
Fishiology - is a nonscientific study of fish, a branch of Aquarist