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Title: The Jelly-FAD: A paradigm shift in the design of biodegradable Fish Aggregating Devices
Authors: Moreno, Gala; Salvador, Joaquin; Zudaire, Iker; Murua, Jefferson; Pelegri, Josep Lluis; Uranga, Jon; Murua, Hilario; Grande, Maitane; Santiago, Josu; Restrepo, Victor
Abstract: Fishers and scientists in the tropical Pacific, Atlantic and Indian Oceans are jointly designing biodegradable fish aggregating devices (bio-FADs) that are efficient for fishing. The tactic followed by most fishers to construct bio-FADs is to maintain the same conventional drifting FAD (dFAD) design (i.e., large, submerged net panels hanging from a floating raft) but replacing plastic ropes and netting with organic ropes and canvases. Results from these experiences show that the lifetime of bio-FADs made with conventional FAD designs is notably shorter than what fishers require, thus precluding their adoption. The short lifespan of these bio-FADs is due to the inefficient design of conventional dFADs, which results in major structural stress. Thus, to successfully replace plastic with organic materials and increase the lifespan of bio-FADs, a paradigm shift is needed. Bio-FAD structures should be re-designed to minimize structural stress in the water. The present study summarizes what we have learned from testing bio-FADs in the three tropical oceans, and it proposes a new concept in dFAD design, the jelly-FAD. Mirroring jellyfish, this new dFAD design will aim for quasi-neutral buoyancy, which should reduce (i) the structural stress of the FAD at sea and (ii) the need for additional plastic flotation. The jelly-FAD is not necessarily a fixed design; it is more of a change in the concept of conventional dFAD construction. Preliminary results show that jelly-FADs aggregate tuna as well as conventional FADs do, with lifespans greater than 6 months at sea. In addition, the jelly-FAD showed average drifting speeds similar to a conventional dFAD. To accelerate the adoption of bio-FADs worldwide, recommendations for jelly-FAD construction and tests are provided.
Keywords: Fish Aggregating Devices; Ecosystem impact; Ghost fishing; FAD; Biodegradable; Tuna fisheries; ALDFG; Marine Pollution; TUNA PURSE SEINERS; TROPICAL TUNA; BEHAVIOR; STRATEGIES; FISHERIES; ATLANTIC
Issue Date: 2023
Type: Article
DOI: 10.1016/j.marpol.2022.105352
ISSN: 0308-597X
E-ISSN: 1872-9460
Funder: FAO-GEF Common Oceans ABNJ Program
Sarebio project from AZTI
Appears in Publication types:Artículos científicos

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