Greenpeace activists say that all tuna should be caught one at a time with poles and lines. But catching tuna is not that simple.

The fact is, four different kinds of tuna species make up canned tuna, each one varying in size, weight and habitat. Likewise, fishing gears have different capabilities — and tradeoffs such as fuel usage. These factors must be considered in order to minimize costs to the environment and impact on consumers’ wallets, as well as maximize efficiency.

Notwithstanding, if fisherman relied on just one sourcing method, tuna companies would not be able to meet global demand — negatively impacting “more than a billion people [who] depend on fish as their primary source of protein.”

Unlike Greenpeace campaigners, who make demands without considering scientific facts and the consequences of their ideas, the tuna industry has heavily invested in the International Seafood Sustainability Foundation (ISSF) to find the most advanced, sound ways to fish tuna and ensure healthy stocks.

To learn more about the different gears, check out our infographic: