Stress from all of these kind of fishing have pushed some species into declining populations. The impact on each species may differ. Conservation Attempts: Laws, which includes banning the retention of marlins in specific places, are in place to protect blue marlin populations. Sport fishing functions generally emphasize conservation techniques, https://costaricafishingexperts.com/wp-content/uploads/2016/09/LosSuenoFishingMarlin.jpg