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Review of mitigation techniques to reduce benthic impacts of trawling


RFx ID : 21310877
Tender Name : Review of mitigation techniques to reduce benthic impacts of trawling
Reference # : MIT2019-02
Open Date : Friday, 26 July 2019 12:00 PM (Pacific/Auckland UTC+12:00)
Close Date : Monday, 2 September 2019 12:00 PM (Pacific/Auckland UTC+12:00)
Tender Type : Request for Proposals (RFP)
Tender Coverage : Sole Agency  [?]
Categories :
  • 70000000 - Farming and Fishing and Forestry and Wildlife Contracting Services
  • 77000000 - Environmental Services
  • 81000000 - Engineering and Research and Technology Based Services
  • New Zealand
Exemption Reason : None
Required Pre-qualifications : None
Contact : DOC Procurement Team
Please direct all communication through GETS
Alternate Physical Delivery Address  : N/A
Alternate Physical Fax Number  : N/A

Trawl induced habitat modifications have been suggested to negatively affect benthic foragers that depend on an intact benthic ecosystem, such as hoiho. Indirect effects are also possible via changes to the structure of the seafloor and the suspension of sediment. The most common mitigation method for these effects have been closures of sensitive areas to trawling. However, in recent years studies that test modified fishing gear to reduce the effects of trawling on seafloor communities have been emerging, with several showing promising results (e.g. Rose et al. 2010). Bottom trawling uses numerous types of gear designs, sizes, rigging and operational methods. Therefore, impact on the bottom habitat will differ among the various bottom trawl fisheries, and mitigation techniques will depend on the gear used.

This desk-based study aims to review literature on mitigation techniques used to reduce benthic impacts of trawling in various bottom trawl fisheries and make recommendations that are relevant to New Zealand trawl fisheries. This study may lead on to a project focusing on trialling modified trawl gear in the inshore fleet.