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Commercial Fishing



Exploring alternatives for live bait in pole-and-line fisheries. What if commercial pole-and-line tuna fisheries could limit their use of live bait?

Using less fuel to catch or source live bait would reduce the carbon footprint of pole-and-line fishing fleets, leading to cost savings and operational efficiencies, raising living standards, and supporting the conservation and management of coral reef resources, to name a few. Equally important, fishers would be able to spend more time with their family at home, improving their work-life balance.

A Sustainable Food Production System

Pole-and-line fishing, also referred to as “one-by-one” fishing, entails using one hook and one line to catch one fish at a time. It is a traditional low-impact fishing method that has been used for millennia in coastal communities throughout the Pacific, Indian, and, more recently, Atlantic Oceans, specifically to catch tuna.

Pole-and-line fishing is regularly recognised as the most sustainable fishing technique because of its capacity to catch commercially viable volumes of tuna while being highly selective with little to no bycatch when compared to other fishing gear types. Furthermore, because each pole requires its own expert fisher, pole-and-line vessels create more employment opportunities thereby stimulating local economies in coastal communities. Local jobs are also created in distribution, processing, and infrastructure.

These fisheries play an important role in global tuna supply chains, especially given the increased demand for ethically sourced and environmentally conscientious seafood. The catch from pole-and-line fishing helps to secure local food while also entering worldwide value chains for canned tuna, which is a staple protein for global food security. Tuna fishing is a means to overcome poverty and as a result, the lifespan of tuna populations, and thus the health of the ocean ecosystem, is critical to these people, and the fate of their children.

Bait Fish

During a pole-and-line fishing operation, small demersal and pelagic forage fish species are thrown into the water in a process called ‘chumming’. The chumming elicits a feeding response from tuna towards the surface near the fishing vessel, allowing the fishers to catch the tuna one at a time.

These forage/bait fish species are globally harvested for fish meal and fish oil and for direct human consumption in enormous quantities. In some areas, these bait fish species have been so extensively overfished that it leads to the collapse of the bait fish fishery which in turn leads to the collapse of the associated pole-and-line fishery, such as in Cabo Verde.

In Indonesia where the Darwin Innovation project is now based, obtaining live bait fish is one of the biggest operational challenges facing the pole-and-line fishery and limits the amount of time that pole-and-line vessels can spend fishing. These vessels are not allowed to fish for their own live bait and have to purchase their bait from local lift net fisheries. Sourcing bait fish is therefore one of the biggest operational expenses.

Innovating Operations

The pilot phase of this project is currently experimenting with alternatives in Indonesia, based on the hypothesis that feeding behaviours in tuna schools are triggered by multiple sensorial stimuli from their environment, such as visual, taste and smell, olfactory, and tactile cues – cues that frequently complement each other.

The project team is hoping to identify the magic combination that maintains the interest of tuna schools, keeping them in the vicinity of pole-and-line fishing boats while they fish. It is likely that quite a bit of further experimentation will be required to achieve this and some obvious challenges remain before such a ‘magic solution’ can be identified. The team does however see this experimental phase as a good opportunity for pushing new boundaries. The ultimate goal is to eventually share the findings with as many fisheries stakeholders as possible and to make any new technology as accessible and replicable as possible.

Underwater programmable LED lights and sound are used to attract a feeding response in skipjack tuna. The approach is extremely novel, especially in the subject of marine acoustics, which is currently understudied. At the moment, research is being performed to establish whether tuna even makes a sound. As a result, IPNLF’s experiments are extremely experimental, and the project plan is continually evolving in response to new facts.

So far, various IPNLF members from across the global seafood value chain have lent their support or expressed an interest in supporting the project, including retail chains like Woolworths in South Africa, Marks & Spencer, and Sainsbury’s in the United Kingdom, and brands like Fish Tales in the Netherlands. Processors, fishing companies, and fishers in both Indonesia and the Maldives are also very interested, recognising that technological innovation that decouples pole-and-line fisheries from their reliance on live bait fish could be a game changer in the industry advancing ocean conservation while also making their fishing operations more cost-effective and efficient.

“To be at the forefront of such an innovative project for small-scale tuna fisheries is truly exciting. We have the potential to develop a new standard in pole-and-line tuna fishing that can offer a replicable model to other low-impact one-by-one fisheries globally. This form of nature-positive food production may be exactly what we should be imagining for wild-caught tuna. When one-by-one fisheries create little harm to the oceans in which they fish, establishing these fisheries for market success could alter the existing tuna industry’s paradigm towards a more positive future — a future in which no one is left behind.” Craig Turley, IPNLF Fisheries Consultant.