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Science as Inquiry

  • Ability to do scientific inquiry (5-8, 9-12)
  • Understanding of scientific inquiry (5-8, 9-12)

    Life Science

  • Populations and ecosystems (5-8)
  • The interdependence of organisms (9-12)

    Science in Personal and Social Perspectives

  • Populations, resources, and environments (5-8)
  • Natural resources (9-12)
  • It's catching on! A new generation of ethical anglers concerned about conserving resources is learning about "catch and release" fishing. Many recreational anglers assume that their impact on the resource is negligible since they only take a few fish. In fact, there are quite a few fisheries in which the recreational harvest equals or exceeds the commercial harvest. Some of these fisheries with high sport harvest include bluefish, red drum, striped bass, Spanish mackerel, spot, spotted seatrout, summer flounder, and winter flounder. It is especially important to release undersized fish so they have a chance to mature, reproduce, and replenish the stock. Additionally, after you've kept the fish you intend to eat and your trophy fish, carefully releasing the rest will help ensure conservation of stocks for the future.

    In 1997, nearly 17 million recreational anglers made 68 million marine fishing trips to the Atlantic, Gulf, and Pacific coasts. When each of these anglers takes a few fish per trip, it adds up! The estimated marine recreational finfish catch was 366 million fish. (How many fish per person per trip were caught?) Commendably, more than 50% of the fish caught were released alive.

    But what happens after they're released alive? Do they survive? Studies have shown that released fish have an excellent chance of surviving, and a new technique has been developed to further improve those odds. One cause of release mortality is swim bladder inflation. When fish are brought to the surface quickly, their swim bladders often rupture due to the pressure change. The air from the swim bladder is then trapped in the gut cavity. The new technique involves venting the air by making a small puncture wound. The puncture wound has a good chance to heal because it's small and covered by scales and muscle. The swim bladder heals in about four days.

    Other causes of release mortality can be found in the North Carolina Wildlife Resources Commission's Catch and Release Guide for Striped Bass. Learn how to determine whether to keep or release fish depending on the circumstances of the catch, and read about other practices to improve survival of released fish.

    One charter boat captain champions the cause of using circle hooks for billfishing and will accept charters only by those who are willing to fish this way. In his experience, this practice results in both an increased rate of catch and a vastly improved condition of the fish caught. (The circle hook is very successful at hooking the corner of a fish's mouth rather than its internal soft tissue or organs.) His dedication to billfish conservation earned him a 1997 award from the Billfish Foundation for tagging and releasing the most billfish ever by a boat captain in a year.

    Tagging programs provide scientists with information about the migration, movement and growth of fish. This type of information is critical to the determination of management measures to protect fish, and there are many tagging programs in which anglers can participate.

    Sponsors of fishing tournaments are also encouraging catch and release by giving citations for fish caught and released. The International Game Fish Association has been responsible for converting kill tournaments to a release format in many areas of the world. Read more about their catch and release/tag and release efforts under "Conservation Efforts". You may also be interested in joining their Junior Angler Club.

    Data Exercise

    To investigate the trend in catch and release fishing with a couple species, go to the National Marine Fisheries Service's Marine Recreational Fisheries Statistics page. Click on Data & Queries and then Do Your Own Query. Under Catch Data, click on Time Series. We are going to compare the total number of fish caught and released versus the total number of fish caught and harvested for two species of fish (striped bass and bluefish) in the Mid Atlantic for each year between 1988 and 2001. So, begin by making the following selections:

    Year Range:     From 1988 to 2001
    Wave:     Annual
    State/Area:     Mid-Atlantic
    Species:     Striped Bass
    Type of Fishing:     All Modes Combined
    Fishing Area:     All Areas Combined
    Type of Catch:     Released Alive (Type B2)
    Information:     Numbers of Fish
    Output Form:     Table (To graph using Microsoft Excel, select Download ASCII File - PC and follow these instructions.)
    Submit Query, and print out the table.

    Repeat for striped bass caught and harvested:

    Year Range:     From 1988 to 2001
    Wave:     Annual
    State/Area:     Mid-Atlantic
    Species:     Striped Bass
    Type of Fishing:     All Modes Combined
    Fishing Area:     All Areas Combined
    Type of Catch:     Harvest (Type A & B1)
    Information:     Numbers of Fish
    Output Form:     Table (To graph using Microsoft Excel, select Download ASCII File - PC and follow these instructions.)
    Submit Query, and print out the table.

    Run the same query for bluefish. Compare the trends.

    For other fisheries-related resources, visit the Bridge's Commercial and Recreational Fisheries page under the Use and Management section, and for information on fish biology, visit our Bony Fishes page. If you have questions about the Data Tip of the Month or have suggestions for a future data tip, contact Laura Rose, Bridge Data Project Manager.


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