The reason for fish dying recently in Bringle Lake remains a mystery that Texarkana, Texas, Parks and Recreation Director Robby Robertson has said may never be solved.

Texas Parks & Wildlife biologist Adam Whisenant of Tyler tested the lake after hundreds of shad, bass and panfish were found floating lifeless in the lake last month.

“They never came back with a conclusive report of anything,” Robertson said. “I think they’re a little bit mystified. They didn’t find anything that should have caused this.”

Robertson said theories were tossed around as to the ...