South of the Khone Falls, upstream migration occurs in October to February, with its peak in November to December; here, it appears to be triggered by receding waters at the end of the flood season.

[7] In August 2015, an environmental group in Santander, Colombia, confirmed that iridescent sharks had been found in one of the tributaries that feed into the Magdalena River, having been accidentally introduced from illegal farm fisheries in the area.

The find has caused alarm amongst the scientific community and government officials, as the Magdalena river is home to over 200 native fish species, 35 of which are endangered.

[9] Disruption to these sharks can come from many physical stressors, including but not limited to shear forces, rapid decompression, blade strike and turbulence.

This is a sad reality[citation needed] since these injured can be caused by hydropower developments which are being put into place to combat the global climate crisis that is being faced.

[10] Iridescent sharks are also introduced to other Southeast Asia countries for food, especially Peninsular Malaysia, Singapore, Indonesia and Myanmar.

[11] In Thailand, swai fish are commonly found in rivers and canals that run past important Buddhist temples or waterside places.

Fish that live in that area, people won't catch them, and often feed them (usually bread), which is considered a merit-making and fun activity.

[15] Pangasius fillets are an increasingly popular product because of their low cost, mild taste and firm texture.