Striped bass are not a threat, according to the Department of Wildlife
Nelson Sergerie, LJI Journalist
GASPÉ – The striped bass is not considered one of the main threats to salmon in the Gaspé Peninsula according to the Department of the Environment, Fight against Climate Change, Wildlife and Parks.
While some anglers cite striped bass as a reason for the declining salmon runs, the department explains that the fear expressed by some stakeholders associated with the salmon fishing industry is linked to a scientific article published in 2018. This study assessed, using telemetry data, the consumption of smolts by striped bass in the Miramichi system in New Brunswick.
“However, the main conclusion of this study is that predation rates by bass vary considerably from one year to the next and that the spatial and temporal overlap of the two species is a determining factor in this annual variation,” explains the department by email.
“In addition, the situation is very different in Quebec, because the level of interaction between smolts and striped bass is much lower than that of the Miramichi. Indeed, studies show that the majority of smolts have already left the rivers when striped bass arrive at their mouths in the spring in the Gaspésie,” adds the ministry.
Striped bass are opportunistic predators that feed on a wide variety of prey. Between 2014 and 2019, the ministry carried out several projects examining the diet of striped bass in Quebec.
As observed across its range, the diet of striped bass consists of a wide variety of forage fish and crustaceans, as well as worms, insects and other invertebrates.
A 2022 report confirms that striped bass in freshwater can consume a certain number of juvenile salmon in freshwater. “However, the presence of striped bass in the freshwater portion of the salmon rivers of the Gaspé is relatively limited and highly variable from year to year, thus minimizing the impact on salmon populations,” maintains the ministry, which adds that another study carried out in the Miramichi system and on the diet of striped bass, published in 2020, concludes that the narrow window of spatio-temporal overlap of the two species means that juvenile salmon represent an insignificant contribution to the striped bass diet.
The report includes findings from a project carried out in 2016 and specifically focused on the diet of striped bass in areas conducive to the presence of juvenile American lobsters.
This species was observed in the stomach contents of 16% of striped bass that had consumed prey. It represented 1.2% of the number of prey ingested and 13% of the total volume. However, the relevance of these findings is limited since the sampling targeted areas identified as “nurseries” for lobster, and lobsters were not found in the stomachs of striped bass caught elsewhere in the Gaspé Peninsula.
As for crab, some were found in the stomach contents of striped bass analyzed as part of the department’s projects.
However, they could not be identified as the species. Given their marine habitat preferences, it is unlikely that they are snow crabs, as they prefer deep and cold waters, while striped bass are more commonly found in coastal waters.
“With regard to the low salmon runs observed in 2023 and 2024 in Quebec rivers, predation by striped bass is not one of the potential causes. The impact of significant predation, if any, would likely be felt locally on one or a few rivers concerned and not in a generalized manner throughout the species’ distribution area, as has been observed for two summers in Quebec,” explains the ministry.
The striped bass observed in the Gaspé Peninsula mainly belongs to the southern Gulf of St. Lawrence population, whose main spawning ground is located in the Northwest Miramichi River.
Their migration has been monitored via telemetrically since 2013, which allowed for an updated knowledge about the distribution of the two striped bass populations in Quebec as of 2018, leading to updates in recreational fishing areas.
Monitoring of the abundance of adult striped bass is conducted by Fisheries and Oceans Canada, Gulf Region, particularly in the Miramichi River. Additionally, the ministry has implemented a monitoring program in recent years to assess the presence and relative abundance of this population in Quebec. Other projects are also underway, including the annual monitoring of recreational fishing in Quebec through a survey of fishermen.
These projects provide information on the distribution of striped bass in the Gaspé Peninsula as well as their frequentation of the territory.
The ministry emphasizes its commitment to maintaining favourable conditions for the stock of striped bass that visit the Gaspé Peninsula, which supports the recreational fishery valued by fishermen in the region and elsewhere.
On this subject, the annual fishing survey shows that about 80% of the recreational fishermen surveyed come from other sectors of Gaspésie, contributing significant economic spinoffs to the region, according to the ministry.
Striped bass are not a threat, according to the Department of Wildlife Read More »