Longlining: Covering Vast Areas Efficiently


Longlining is a fishing technique that has been used for centuries. It involves setting a long line with baited hooks to target specific fish species. Longlines are commonly used in commercial fisheries and are known for their ability to cover vast areas of the ocean efficiently. In this article, we will explore the advantages, disadvantages, and applications of longlining in various fishing scenarios.

Advantages of Longlining

1. Efficiency: Longlining is an efficient fishing method as it covers a large area compared to other fishing gears such as gillnets or trawls. A longline can extend for kilometers and have hundreds or even thousands of baited hooks. This allows fishermen to target a larger number of fish in a shorter amount of time.

2. Selectivity: Longlines can be designed to be specific to certain fish species, allowing fishermen to target their desired catch. By adjusting the bait type, hook size, and depth at which the hooks are set, fishermen can minimize the catch of non-targeted species or sizes.

3. Minimal damage to the seafloor: Unlike trawling, which involves dragging a net across the seafloor, longlining has minimal impact on the benthic habitat. This makes it a more environmentally friendly option, particularly in areas with vulnerable or protected marine ecosystems.

4. Ability to cover different depths: Longlining is well-suited for surveys or fishing operations that target areas with varying depths. By adjusting the length of the line and the depth at which the hooks are set, fishermen can effectively target fish species that inhabit different parts of the water column.

Disadvantages of Longlining

1. Bycatch: One of the main disadvantages of longlining is the potential for bycatch, which refers to the unintentional capture of non-targeted species. Although longlines can be designed to reduce bycatch, there is still a risk of capturing various marine organisms, including sharks, turtles, seabirds, and other fish species.

2. Gear loss: Longlines are susceptible to gear loss due to factors such as strong currents, weather conditions, or interactions with other marine animals. Lost gear can lead to ghost fishing, where the abandoned lines continue to catch fish and other animals. This can have negative impacts on marine ecosystems and fisheries.

3. Cost and labor-intensive: Setting and retrieving longlines can be labor-intensive and time-consuming. It requires a skilled crew to handle and bait the hooks, as well as manage the logistics of deploying and retrieving the longline. The cost of equipment and maintenance can also be significant.

Applications of Longlining

1. Commercial fishing: Longlining is widely used in commercial fisheries around the world. It is especially popular for targeting species such as tuna, swordfish, and halibut. The ability to cover large areas efficiently makes longlining an attractive option for commercial fishermen looking to maximize their catch.

2. Scientific research: Longlines are commonly used in scientific research to survey fish populations and collect data on abundance, species composition, and size distribution. Longline surveys provide valuable information for fisheries management and conservation efforts.

3. Tagging and tracking studies: Longlines are often used as a method to tag and track the movement of individual fish or marine animals. By attaching satellite tags to the fish or animals caught on the longlines, scientists can gather data on migration patterns, habitat use, and behavior.

4. Bycatch reduction techniques: Efforts are continually being made to develop and implement strategies to reduce bycatch in longline fisheries. These include using circle hooks that are less likely to be swallowed by non-targeted species, using bird scaring lines to deter seabirds from diving onto the hooks, and using underwater baits or bait modification techniques to minimize the attractiveness to non-targeted species.


Longlining is a fishing technique that offers numerous advantages in terms of efficiency, selectivity, and minimal impact on the seafloor. Although it has some disadvantages, such as the potential for bycatch and gear loss, efforts are being made to mitigate these risks. Longlining has applications in commercial fishing, scientific research, and bycatch reduction efforts, making it a versatile and widely used fishing method. As fisheries management and conservation practices continue to evolve, the responsible and sustainable use of longlines will play a crucial role in ensuring the health and viability of our marine ecosystems.

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