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Accidental Bait: Do Deceased Fish Increase Freshwater Turtle Bycatch in Commercial Fyke Nets?

Content Provider	Springer Nature Link
Author	Larocque, Sarah M. Watson, Paige Blouin Demers, Gabriel Cooke, Steven J.
Copyright Year	2012
Abstract	Bycatch of turtles in passive inland fyke net fisheries has been poorly studied, yet bycatch is an important conservation issue given the decline in many freshwater turtle populations. Delayed maturity and low natural adult mortality make turtles particularly susceptible to population declines when faced with additional anthropogenic adult mortality such as bycatch. When turtles are captured in fyke nets, the prolonged submergence can lead to stress and subsequent drowning. Fish die within infrequently checked passive fishing nets and dead fish are a potential food source for many freshwater turtles. Dead fish could thus act as attractants and increase turtle captures in fishing nets. We investigated the attraction of turtles to decomposing fish within fyke nets in eastern Ontario. We set fyke nets with either 1 kg of one-day or five-day decomposed fish, or no decomposed fish in the cod-end of the net. Decomposing fish did not alter the capture rate of turtles or fish, nor did it alter the species composition of the catch. Thus, reducing fish mortality in nets using shorter soak times is unlikely to alter turtle bycatch rates since turtles were not attracted by the dead fish. Interestingly, turtle bycatch rates increased as water temperatures did. Water temperature also influences turtle mortality by affecting the duration turtles can remain submerged. We thus suggest that submerged nets to either not be set or have reduced soak times in warm water conditions (e.g., >20 °C) as turtles tend to be captured more frequently and cannot withstand prolonged submergence.
Starting Page	31
Ending Page	38
Page Count	8
File Format	PDF
ISSN	0364152X
Journal	Environmental Management
Volume Number	50
Issue Number	1
e-ISSN	14321009
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-04-28
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inland commercial fisheries Bycatch mortality Decomposition Olfaction Fyke nets At-risk species Nature Conservation Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Forestry Management Environmental Management Atmospheric Protection/Air Quality Control/Air Pollution Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Pollution Global and Planetary Change

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Accidental Bait: Do Deceased Fish Increase Freshwater Turtle Bycatch in Commercial Fyke Nets?

Accidental bait: do deceased fish increase freshwater turtle bycatch in commercial fyke nets?

Mitigation of freshwater turtle bycatch and mortality associated with inland commercial fyke-net fisheries

Fishing Effort and Catch Composition of Urban Market and Rural Villages in Brazilian Amazon

Fishing Farmers or Farming Fishers? Fishing Typology of Inland Small-Scale Fishing Households and Fisheries Management in Singkarak Lake, West Sumatra, Indonesia

Rights and Conflicts in the Management of Fisheries in the Lower Songkhram River Basin, Northeast Thailand

A Model of Navigation-Induced Currents in Inland Waterways and Implications for Juvenile Fish Displacement

Assessing Potential Conservation and Restoration Areas of Freshwater Fish Fauna in the Indian River Basins

Condition and mortality of western painted turtle collected as bycatch in modified fyke nets during fish population assessments

Accidental Bait: Do Deceased Fish Increase Freshwater Turtle Bycatch in Commercial Fyke Nets?

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Accidental Bait: Do Deceased Fish Increase Freshwater Turtle Bycatch in Commercial Fyke Nets?

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Accidental Bait: Do Deceased Fish Increase Freshwater Turtle Bycatch in Commercial Fyke Nets?