Tag Archives: Rockfish Conservation

Marine Reserves for Rockfish

March 10, 2019Fish, Kodiak WildlifeMarine Protected Area, Marine Reserves, Marine Reserves for Rockfish, Rockfish Conservation, Rockfish in Alaskaadmin

Should fisheries managers implement marine reserves to protect fragile rockfish populations? This week, I’ll tackle the controversial subject of marine reserves. What are they; do they work; and should they be employed to protect rockfish populations and help already depleted populations recover?

Two weeks ago, I discussed rockfish conservation, and last week, I explained how to implement the deep-water release technique for rockfish. If you missed either of those two posts, I suggest you read them to understand the biology and physiology of rockfish and why rockfish populations are fragile and subject to overfishing.

Marine reserves have been developed in certain areas where rockfish have been over-harvested. Before I start discussing the pros and cons of marine reserves, though, I want to differentiate between a few ecological terms I find confusing.

Marine Protected Area (MPA): This broad term covers a variety of management areas, including marine sanctuaries, estuarine research reserves, ocean parks, and marine wildlife refuges. Some MPAs are established to protect ecosystems, while others preserve cultural resources such as shipwrecks and archaeological sites, and still others are established to sustain fisheries production. Nearly all MPAs in the United States allow a variety of human activities, including fishing.

Marine Reserve: A Marine Reserve is a special, restrictive type of MPA where either no or only limited fishing (sport or commercial) and development are allowed. Marine Reserves are sometimes further divided into “Marine Reserves,” and “No-Take Marine Reserves.” When used together, these two terms usually mean managers allow some fishing for certain species in a Marine Reserve but place a ban on all fishing in a No-Take Marine Reserve.

When you add terms such as Marine Parks, Marine Preserves, and National Marine Sanctuaries to the mix, you end up scratching your head, wondering what each designation means. In this post, when I discuss marine reserves, I am talking about the implementation of a distinct area closed to all fishing.

Fisheries managers in the eastern North Pacific have designated several marine reserves in critical rockfish habitat where rockfish have been overfished. By prohibiting fishing in these areas, managers hope to rebuild overfished populations and protect spawning and nursery habitat. By closing an area to all fishing, biologists can protect rockfish not only from anglers who target rockfish but also from anglers who fish for other species and harvest rockfish as by-catch.

Fishermen generally do not like marine reserves because they lose fishing areas. Reserves protecting rockfish are also controversial because studies suggest as much as 20% of rockfish habitat would have to be closed for a reserve to be effective. Also, reserves displace effort and place pressure on open areas.

Some reserves appear to have benefitted local rockfish populations, but biologists are still uncertain about the overall success of reserves for managing rockfish. Since rockfish do not reproduce until they are several years old, though, and since few larvae survive to reach adulthood, it could take years to realize the benefits of rockfish reserves. Are we willing to wait before we judge the efficacy of these protected areas?

I planned to write two posts on rockfish and ended up writing six. The more I learned about these interesting fish, the more questions I had. I hope I found a few readers who are as intrigued by rockfish as I am. Before tackling my next group of fish, I’ll write a few posts on other topics.

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Robin Barefield is the author of three Alaska wilderness mystery novels, Big Game, Murder Over Kodiak, and The Fisherman’s Daughter. To download a free copy of one of her novels, watch her webinar about how she became an author and why she writes Alaska wilderness mysteries. Also, sign up below to subscribe to her free, monthly newsletter on true murder and mystery in Alaska.

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Deepwater-Release Technique for Rockfish

March 3, 2019Fish, Kodiak WildlifeDeepwater Release, Deepwater-Release Technique for Rockfish, Protecting Rockfish, Robin Barefield, Rockfish Conservation, Rockfish in Alaskaadmin

This week, I ‘ll describe the deepwater-release technique developed for rockfish. In my last post, I wrote about rockfish conservation and talked about ways anglers can help preserve vulnerable rockfish populations. Due to their unvented swim bladder, rockfish are extremely sensitive to changes in water pressure. When an angler catches a rockfish in water deeper than 90 ft. (27.43 m) and reels it to the surface, the fish’s swim bladder rapidly expands, compressing internal organs and often pushing the stomach out through the mouth. These pressure change can also rupture blood vessels, tear the swim bladder, and cause bulging eyes or gas bubbles in the eyes.

Stomach protruding from yelloweye rockfish mouth — Distressed Rockfish

Sometimes rapid pressure changes cause physiological damage so severe it kills the fish, but in other instances, the fish can survive if the angler quickly returns it to the depth where it was caught.

Since a rockfish’s swim bladder rarely deflates on its own once the fish arrives at the surface, the fish cannot dive and instead floats until it dies or is eaten. Anglers sometimes mistakenly feel they can help the fish by either puncturing the stomach protruding from the fish’s mouth or puncturing the fish’s body to let air out of the swim bladder. This technique, called “fizzing” or “venting,” often leads to infection and eventual death.

Recently, biologists have developed a new deepwater-release technique to submerge rockfish as quickly as possible either to the depth where they were caught or 100 feet (30.5 m), whichever comes first. Research on this technique has shown a substantial increase in the survival of released rockfish. One laboratory study produced a survival rate of 96% for recompressed rockfish. Another study in the wild found only 22% of yelloweye rockfish released at the water’s surface managed to submerge, but 98% of yelloweyes survived when submerged to the depth where they were captured.

The Alaska Department of Fish and Game has now added the deepwater-release technique to its list of “best practices” for anglers to employ to minimize release mortality of rockfish. Biologists believe if they can convince anglers to use this technique, as well as follow other rockfish conservation methods, rockfish mortality will decrease significantly.

What is the deepwater-release technique? It is a simple procedure, but since time is critical, rockfish anglers should have the gear ready and be prepared to implement the technique as soon as the rockfish arrives at the surface.

Several deepwater-release devices, from simple to sophisticated, can be purchased, but you can also easily make your own deepwater-release device. Begin with a 3-lb. jig with a single hook and grind the barb off the hook. Next, take a fishing rod and attach the line to the bend of the hook. Assemble the device and have it ready to go before you start fishing. The fish is much more likely to survive if you minimize its time at the surface, so have the device assembled and make sure you know what to do before you catch a rockfish.

If you think you have a rockfish on the line, quickly reel the fish to the surface. The swim bladder will inflate regardless of your reeling speed. Remove the hook from the fish’s mouth and attach the release device. If using a homemade device, hook the barbless hook through the soft tissue of the jaw. Gently drop the fish back into the water and release the anti-reverse on the reel, allowing the line to free spool. Allow the fish to descend until either the jig hits bottom, or reaches 100 ft., whichever comes first. Then, give the rod a hard tug to release the fish. The faster you can perform this technique, the more likely the rockfish will survive.

Next week, I’ll discuss marine reserves as a possible management option to protect rockfish populations. Reserves are controversial because both sport and commercial fishing are prohibited in reserves, and many biologists question if reserves work as a form of conservation.

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Rockfish Conservation

February 24, 2019Fish, Kodiak WildlifeBlackRockfish, Robin Barefield, Rockfish, Rockfish Conservation, Yelloweye Rockfishadmin

This week, I want to discuss rockfish conservation. Over the past few weeks, I’ve discussed how rockfish are more vulnerable to overfishing than most species of fish, and non-pelagic rockfish populations are particularly fragile. Rockfish prefer rocky habitats where anglers can easily find and target them, and rockfish are quick to take a lure, making them easy to catch. Also, they grow quickly but mature slowly, so they are often caught before they can reproduce and sustain their population. It is their physiology, though, not their lifestyle which makes rockfish susceptible to annihilation by anglers.

Rockfish rarely survive catch-and-release fishing because they have an unvented swim bladder. The swim bladder is a balloon-like organ which adjusts the buoyancy of a fish. As the fish ascends toward the surface, the swim bladder inflates. If the swim bladder has a vent, it can easily again deflate when the fish dives, but a rockfish cannot quickly deflate its swim bladder, and since the fish normally remains in deep water, it has no need to make large adjustments in the inflation or deflation of its bladder. When an angler catches a rockfish, though, and reels it to the surface, the gasses in the swim bladder expand and compress internal organs. Often, by the time the fish reaches the surface, the stomach bulges into the mouth cavity. Other common pressure-change injuries include ruptured swim bladders, ruptured blood vessels in internal organs, and bulging eyes or gas bubbles in the eyes.

Once the swim bladder of a rockfish has completely expanded, it will not likely deflate on its own because it does not have a vent. If the angler releases a fish with an inflated swim bladder, the fish floats on the surface until it suffocates, or something eats it. Gulls often land near floating fish and peck out its eyes while the fish is still alive.

Rockfish are good to eat and are harvested in commercial, sport, and subsistence fisheries from California to Alaska. Anglers have depleted many rockfish populations from British Columbia to California, and even when fisheries managers enact strict regulations or completely ban fishing in certain areas, these populations are slow to recover. Only older rockfish can reproduce, and few rockfish larvae survive to reach maturity.

Rockfish are not easy to manage because they live in deep, rocky spots where biologists cannot employ traditional sampling techniques. In Alaska, researchers do not know the abundance of most rockfish stocks, so fisheries managers have elected to implement strict regulations for catching and retaining rockfish, especially for yelloweye and other non-pelagic rockfish. Since even the rockfish anglers release are likely to die, though, biologists now focus on informing anglers of the fragility of rockfish populations.

The Alaska Department of Fish and Game distributes literature to sportfishing guides and posts informational signs near boat ramps to encourage anglers to follow these guidelines to avoid catching rockfish or to at least minimize rockfish harvest.

Angler's Guide to the Rockfishes of Alaska

If you are not targeting rockfish, avoid fishing where you are likely to catch them. Rockfish inhabit the steep sides of rock piles and reefs. Lingcod are found at the top of rock piles and reefs, and halibut lie on the flat bottom near a reef.
If you are targeting lingcod or halibut, keep your jig 10-15 ft. (3-5 m) off the bottom. Researchers in Oregon found this technique significantly reduced rockfish bycatch but did not affect the odds of catching halibut and actually increased the success rate for landing lingcod.
If you want to retain a few rockfish along with other species, target the other species first and retain any incidental rockfish you catch.
Fish with a circle hook. Circle hooks stick in the mouth and are not ingested, so they are easier to release and less likely to cause a serious injury.
Remember, rockfish only have a freezer life of four months, so don’t catch more than you can eat.
If targeting rockfish, implement deep-water-release methods.

In my next post, I will discuss deep-water-release techniques in more detail. This simple concept produces surprisingly successful results.

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