Three juvenile Natrix natrix (Reptilia) as prey of Oncorhynchus mykiss (Actinopterygii, Salmoniformes, Salmonidae) in a Bavarian stream

Key Points

• To document a rare instance of juvenile grass snakes found in the diet of rainbow trout, emphasizing the dietary habits of the species.
• Dissection of stomach contents from a rainbow trout caught in the Ammer River, Bavaria.
• Identification of juvenile grass snakes as prey based on anatomical features.
• Three juvenile grass snakes were found in the stomach of one rainbow trout.
• This finding adds to the limited evidence of reptiles being a food source for salmonids.