The redish color fish is not an indicator of its kosher status.
The Puffer fish is dyed to look like salmon.
Rock salmon (Shark family) is dyed to look like salmon.
Associated Press , THE JERUSALEM POST Aug. 23, 2007
Unscrupulous vendors in Thailand have been selling meat of the deadly puffer fish disguised as salmon, causing the deaths of more than 15 people over the past three years, a doctor said Thursday.
Although banned since 2002, puffer fish continues to be sold in large quantities at local markets and restaurants, said Narin Hiransuthikul of Bangkok's Chulalonkorn University Hospital.