5.8 Impacts of Overfishing

Enduring Understanding:When humans use natural resources, they alter natural systems.Learning Objective:Describe causes of and problems related to overfishing. Essential Knowledge:Overfishing has led to the extreme scarcity of some fish species, which can lessen biodiversity in aquatic systems and harm people who depend on fishing for food and commerce. Will the ocean ever run out of fish? - Ayana Elizabeth Johnson and Jennifer Jacquet Answer the fill in the blanks that follow using this video. While viewing the video, answer the following questions by using the Click Word Bank. Fish are in trouble. Modern industrial fishing is the fishing that stocks our grocery shelves. Sometimes seabirds, turtles, and dolphins can be caught in commercial fishing nets.The Patagonian toothfish was rebranded the Chilean sea bass, causing its popularity to increase. These fish do not reproduce until they are 10 years old, making them extremely vulnerable to overfishing. It reminds me of the age structure diagrams and what happens when a population has a stark decrease in their pre-adolescent numbers. The population declines over time - Ex. Japan.Sharks are used for shark fin soup so fishermen have begun cutting off the fin and releasing the dead shark back into the ocean. The fin is the "profitable" portion of the shark, so it is the only thing that's used.When unwanted animals are caught in fishing nets, orbycatch, die and are thrown back into the ocean.We need to stop overfishing for the benefit of ecosystems, food security, jobs, economies, and coastal cultures.Notice how many times ecosystem services came up in this video:1. Provisioning Services - Food2. Cultural Services - Opportunities for tourism, recreation, and cultural identity and heritage. Overfishing Fill in your note sheet as you view the Edpuzzle. 5.8 Overfishing Notes - Link to Edpuzzle What are the causes of overfishing? Sort the description with the term. Unsustainable Fishing catching more fish than the amount needed to maintain a productive fish population Bycatch Results from fisheries capturing unintended species Treated like waste, thrown overboard either dead or dying most often its numbers are higher than the actual wanted species Harmful Fishing Gear bottom trawls, gillnets, and dredges affect sea floor habitats INCREASE bycatch Illegal, Unreported, and Unregulated Fishing conducted in violation of national laws conducted in violation of internationally agreed conservation and management measures in effect 5.8 Impacts of Overfishing DOL Use A, B, C, D, or E to answer the 4 following questions. A D D B