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Xiphias gladius

Method of production - Caught at sea
Capture method - Harpoon
Capture area - South East Pacific (FAO 87)
Stock area - South East Pacific
Stock detail - All Areas
Certification -
Fish type - Oily fish

Sustainability rating Click for explaination of rating

This fish, caught by the methods and in the area listed above, is a good sustainable fish to eat. Click on the rating icon above to read more and on the alternatives tab below to find similar fish to eat.

Sustainability overview

Swordfish in this region are both targeted for and landed as byproduct in directed tuna fisheries. To a lesser extent they are also taken in artisanal net and harpoon fisheries off the coast of South America. The last stock assessment, updated in 2011 indicated that stocks were in a healthy state and were being harvested sustainably. Bycatch of vulnerable species such as birds, sharks and turtles is of concern in both the pelagic longline fisheries and net fisheries. Various measures are available and required to be used to reduce bycatch in the longline fisheries yet monitoring is deficient and their effectiveness is yet to be evaluated. There are few management measures that apply specifically to the gill net fisheries and reporting is largely deficient. Harpooning is very selective capture method and is a more sustainable option yet accounts for a small proportion of the catch.

Buy swordfish from fisheries that are well regulated by their flag state to ensure that bycatch mitigation devices are being employed and monitored. Commercial buyers in particular should establish what measures the flag state is taking to improve deficiencies in reporting interactions with vulnerable species and specify the need for ongoing and demonstrable improvements. Large buyers should consider supporting such improvements.


Swordfish is the only member of the family Xiphiidae. It is a highly migratory species, moving towards temperate or cold waters in summer to feed and returning to warmer waters to spawn. They are apex predators that feed opportunistically. Squids and fishes are major prey items. In the South-East Pacific Ocean (SEPO), spawning takes place in summer months. Usually solitary, it forms large schools during spawning. A fast growing fish, swordfish in the SEPO mature at 2-3 years of age, when they 115-120cm (males) and 165-175cm (females).They can attain a maximum size of 4.5m and a weight of 650kg. Swordfish tolerate temperatures of about 5 to 27C, but their optimum range is about 18 to 22C, and larvae have been found only at temperatures exceeding 24C.

Stock information

Stock area
South East Pacific

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Stock information
The South-east Pacific swordfish stock is managed by both the Inter-American Tropical Tuna Commission (IATTC) and the Western and Central Pacific Fisheries Commission (WCPFC). The most recent stock assessment was updated in 2011, and indicated that the stock was not experiencing overfishing and was not overfished. Results indicated that the spawning biomass had decreased to a low of about 43,000 t in 1993 and had been increasing since, reaching about 135,000 t in 2010t. At the same time as this increase, the annual catch by all fisheries was maintained at an average 12,000t during the 10 year period ending in 2010. Spawning biomass was estimated to be at 50% above the carrying capacity, and substantially above the level which is expected to produce catch at the level of Maximum Sustainable Yield (1.45SBmsy). Catches have increased in the last few years towards the estimated MSY of 25,000 t with 2011 - 2013 catches at approximately 24,000t a year. It is not clear whether this is due to increased abundance of swordfish or increased effort directed toward that species.

A new stock assessment is needed to gain a better understanding of current stock status.


As for tuna, individual swordfish stocks range across and are accessed by numerous coastal states, making harmonised and effective management of these individual stocks very difficult. As a result, intergovernmental Regional Fisheries Management Organisations (RFMOs) have been established. There are five main tuna RFMOs worldwide and it is their responsibility to carry out data collection, scientific monitoring and management of these fisheries. Whilst the RFMOs are responsible for the development of management and conservation measures, the degree to which they are implemented, monitored and enforced still varies significantly between coastal states. The main countries reporting swordfish catches in this region are (In order) Japan, Taiwan and the USA with smaller catches from many Pacific coastal states.

There is no Total Allowable Catch (TAC) set for this stock yet WCPFC participating coastal states are expected to have set national TACs which are not to exceed the maximum level reported in any one year between 2001 and 2006. Management measures that apply to directed tuna fisheries are expected to also benefit swordfish stocks.

To help address IUU, the WCPFC maintains an IUU Vessel List; and all transhipments at sea are to be documented and 100% observed as part of the regional observer programme.

There is 5% observer coverage for vessels over 20m.

Capture information

In the South-east Pacific Ocean, swordfish are mostly caught in mixed species longline fisheries by Chilean, Japanese and Spanish fleets. In recent years, Spain has dominated catches. Much smaller quantities are taken in artisanal harpoon and gill net fisheries off the coast of South America. Harpooning, whilst labour intensive, is a very selective method of fishing with minimal impact on the marine ecosystem.

Read more about capture methods

Froese, R. and Pauly, D. Editors, 2015. FishBase. Available at [Accessed Dec 2015].

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