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The majority of dogtooth tuna captures have tended to be made by trolling with dead and live baits or with lures, particularly deep-swimming plugs. [8] These techniques are still often used, with one niche specialty being the use of live bait such as rainbow runners to tease dogtooth tuna within range of light tackle and fly-casting anglers.
Rare encounters with divers and accidental catches have supplied what little is known of oarfish ethology (behavior) and ecology. In 2001, an oarfish was filmed alive in the wild. The 1.5-metre (4.9-foot) fish was spotted by a group of U.S. Navy personnel during the inspection of a buoy in the Bahamas.
The European perch is a frequent prey of many fish-eating predators such as the Western osprey (Pandion haliaetus), [17] great cormorant (Phalacrocorax carbo) [18] [19] and common kingfisher (Alcedo atthis), [20] [21] and it is an important item in the diet of the globally threatened Dalmatian pelican (Pelecanus crispus). [22]
The blue runner is a fast-swimming predator which primarily takes small benthic fishes as prey in inshore waters. [10] Studies on the species diet on both side of the Atlantic have shown similar results. A Puerto Rican study found the species supplements its fish dominated diet with crabs, shrimps, copepods and other small crustaceans. [25]
One specimen caught 1500 km east of Wellington in 2015 was estimated to be over 230 years old. [2] Orange roughy caught near Tasmania have been aged at 250 years. [2] The orange roughy is the longest-lived commercial fish species, and does not breed every year, which has important implications for its conservation status. [9]
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This fish is a substrate breeder that displays biparental care after the fry have hatched from their eggs. One study [ 67 ] examined reproductive and social behaviors of this species to see how they accomplished their pit spawning, including different physiological factors such as hormone levels, color changes, and plasma cortisol levels.