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Developing a full-scale shaking codend to reduce the capture of small fish.

Vang Y Nguyen¹, Shannon M Bayse¹, Zhaohai Cheng¹

¹Fisheries and Marine Institute, Memorial University of Newfoundland, St. John's, NL, Canada.

|January 23, 2023

Summary

A novel shaking codend effectively reduces undersized redfish capture in trawls. This innovative design enhances fish escape, offering a promising solution for sustainable fisheries management.

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Area of Science:

Fisheries Science
Marine Biology
Engineering

Background:

Undersized fish retention in redfish trawls poses ecological and economic challenges.
Current codend designs struggle to effectively release small fish, leading to bycatch issues.

Purpose of the Study:

To develop and evaluate a full-scale shaking codend to reduce the retention of undersized redfish (Sebastes spp.).
To assess the movement and fishing characteristics of the shaking codend compared to a standard T90 codend.

Main Methods:

A mechanical stimulating device was integrated into a T90 codend to create a 'shaking motion'.
Flume tank tests evaluated codend dynamics (amplitude, acceleration, drag) at various velocities (1.0-1.8 kt).
Field experiments were conducted to assess the impact on redfish capture, with preliminary results analyzed.

Main Results:

The shaking codend exhibited significantly higher amplitude, acceleration, and drag forces than the standard T90 codend.
Field tests indicated a significant reduction in the capture of small redfish (< 21 cm) using the shaking codend.
The model for the shaking codend did not require contact probability, unlike the standard codend.

Conclusions:

The shaking codend's unique dynamics effectively stimulate fish movement and increase escape probability.
This technology presents a potentially effective method for reducing undersized redfish bycatch in trawl fisheries.
The concept may be applicable to other trawl fisheries for minimizing the catch of small fish.