Kao Cheng-sheng explains that the association had originally thought to include the entire upstream portion of the Tsengwen River. But later it was discovered that it was only after each occasion when the downstream fish died off because of the effects of poisons poured into the upstream part of the river that someone would set off in search of the offenders, but because the mountain roads are remote, it would always be impossible to catch them.
高正勝解釋，協會原擬將整條曾文溪上游水系全部納入，但後來發覺，每當溪裡魚蝦因上游毒氣殘留藥物之影響而死亡後，才往源頭搜尋罪犯，卻由於山路遙遠，無法逮住歹徒。