Mergupe
Perciformes - Perches
Salmoniformes - Salmons and Trouts
Esociformes - Pikes
Siluriformes - Catfishes
Cypriniformes - Carps
Gadiformes - Cods
Scorpaeniformes - Mail-cheeked fishes
Clupeiformes - Herrings
Anguilliformes - Eels and morays
Pleuronectiformes - Flatfishes
Gasterosteiformes - Sticklebacks
Gobiiformes - Gobies
Osmeriformes - Smelts
Lamniformes - Mackerel sharks
Petromyzontiformes - Lampreys
Perciformes - Perches
Salmoniformes - Salmons and Trouts
Esociformes - Pikes
Siluriformes - Catfishes
Cypriniformes - Carps
Gadiformes - Cods
Scorpaeniformes - Mail-cheeked fishes
Clupeiformes - Herrings
Anguilliformes - Eels and morays
Pleuronectiformes - Flatfishes
Gasterosteiformes - Sticklebacks
Gobiiformes - Gobies
Osmeriformes - Smelts
Lamniformes - Mackerel sharks
Petromyzontiformes - Lampreys
The Mergupe river is the 53 km long left confluence of the Lielā Jugla.