by Sophia Newcombe Fisheries Field Technician, MCG

Aquatic Invasive Species
Aquatic species that are non-native and have harmful effects on the ecosystem are referred to as aquatic invasive species. Aquatic invasive species pose a large threat to native aquatic species in Nova Scotia due to factors such as resource competition and predation. One of these aquatic invasive species is the chain pickerel (Esox niger), which was purposely introduced to three lakes in Nova Scotia in 1945. Unfortunately, chain pickerel have now spread to at least 95 known locations throughout the province via illegal transport and dispersal throughout watersheds.

Morphological and Biological Characteristics
Relatively easy to identify, chain pickerel look like a slender pike and are 15-18 inches long on average. Their mouths, full of backwards pointing teeth to prevent their prey from escaping, look like a duck bill. Another identifying and easily remembered characteristic of a chain pickerel is the chain-like pattern along their bright to olive green or brown body. Additionally, they have a long snout and head as well as a deeply forked tail.

Spawning in chain pickerel occurs in early spring within shallow weeded areas. The females typically lay 6,000-7,000 eggs but can lay up to 50,000. In their first year of life, juvenile chain pickerel can reach 4 inches in length by fall. After one to four years, chain pickerel reach sexual maturity and begin to contribute to the population. Genera ...