The new study provides the first detailed documentation of surface-water fish diving to spawn at 450 feet. The discovery of this rare spawning behavior in Albula vulpes is unprecedented. Using active acoustic rangefinder ոն sonor data along the south coast of Abaco, the Bahamas, led by a team of scientists from the University of Florida’s Institute of Oceanography, Bonefish & Tarpon Trust համալս University of Massachusetts, Amherst 6 In shallow water less than a foot, they dive “deep” into the abyss to lay eggs.
Although preliminary studies in 2013 showed that bony fish descended to the spawning ground by about 164 feet, this new scientific discovery reveals that bony fish descended to a depth of 450 feet, moving below 325 feet. spawning up to 220 feet two hours ago. The results of a study published in the journal Marine biology, will be a tool for the preservation of these economically and culturally important fish species.
“We were amazed at this discovery as the bony fish came out of the incredibly steep rack that fell into the Abacus Providence Canal,” said Steven Lombardo, Ph.D. Candidate, working for Matt Ajemyan, PhD, Senior Author, Assistant Professor of Research, Harbor Branch, FIFA, Head of the Fisheries Ecology (FEC) Laboratory. “Data from our acoustic telemetry labels showed in real time that the bones are able to withstand extreme pressures. “When they reached 334 feet on the first dive, we covered the floor, and 45 minutes later, when they reached a depth of 450 feet, we were absolutely amazed.”
Scientists have found that although bony fish live less than 6 feet in surface water, they dive “deep” into the abyss to lay their eggs. Now that they know that bony fish farming requires spawning conditions, they can better focus their efforts on conserving the habitat. Loan: Aaron Adams, PhD
Acoustic acoustic rangefinder allowed scientists to observe ovulation movements և is a method that uses small pill-like labels that are surgically inserted into a fish’s abdomen, emitting an ultrasound ping every three seconds. The researchers listened to the pings emitted from the tags by means of a directional hydrophone mounted on the boat to determine the strength of the signal transmitted from the tag to the hydrophone in which direction the ship was moving and following the fish. Each ping labeled inside the fish passed the data to the scientists, informing them of the depth of the fish’s location and the water temperature.
The researchers spent four days at sunrise watching the initial spawning of the bony fish, hoping that they would be transferred to the coastal spawning eggs. On the last night of their research voyage, at sunset, the bony fish began to “squeeze”, where they squeezed the air on the surface, and then continued to move ashore, traversing the edge of the continental shelf. Successful observation of bony fish spawning on water closed the 18-hour shift for two days.
“Retrieving the bones from their offshore spawning migration was a marathon for the research team, as well as for the fish,” said Aaron Adams, Ph.D. & Tarpon Trust. “The most important thing for protection. “Now that we know what the conditions are for bone fish to lay eggs, we can better focus our efforts on conserving the habitat.”
When many species of marine fish spawn, they spawn in groups known as laying hens. These fish follow a process known as “broadcast spawning” in which males and females hatch sperm and eggs into open water where the eggs are fertilized. The eggs hatch in about a day, փոքրիկ the little larvae that hatch from the eggs, depending on the species, live in the open ocean as plankton, days before they find shallow water and become juveniles. Adults of many of these species move long distances from their home area to spawning grounds, often laying eggs on the edges of deep-water reefs.
Unlike other marine fish, bony fish participate in a unique three-point spawning migration that travels up to 70 miles from surface water habitats to lay offshore prenatal eggs for breeding abroad. Before arriving at the spawning grounds, they gather in large groups, often numbering between 5,000 and 10,000 bony fish.
“Despite their economic and cultural potential, there are concerns about the long-term health of bone fishing. “In some places, due to habitat loss and harvest, bony fish are classified as ‘imminent threats’, so information on their reproduction is important for conservation efforts,” Ajemyan said. “We continue to work on marine spawning movements. “We will watch more spawning events in different places, and we will describe what the caterpillar bones can feed at these great depths.”
This study will support the ongoing efforts of the Gold Fish Reproduction Research Program at the FAU Port Branch to report on the techniques used to track captive egg larvae during and after the developmental feeding stage.
Bones are known around the world for their speed, fighting light sports, supporting economic and cultural fishing in the tropics. The annual economic impact of fishing in Florida Keys exceeds $ 465 million, in the Bahamas – $ 169 million, and in Belize – $ 53 million. In most of the Bahamas, fishing accounts for about 40 percent of the economy, with fishing jobs often being one of the highest paid, and the occupation is often family-based.
Reference. “Bone spawning specimens (Albula vulpes), surface water fish” by Steven M. Lombardo, Aaron J. Adams, Andy J. Danylchuk, Cameron A. Luck և Matthew J. Ajemian, November 23, 2020, Marine biology,
DOI: 10.1007 / s00227-020-03799-3:
The study was co-authored by Andy D. Danilchuk, PhD in Environmental Studies, University of Massachusetts Amherst, Ph.D. Կար Graduate of the North Carolina Department of Environmental Quality, Cameron A.
Funding for this research was provided by the Bonefish & Tarpon Trust ազգային National Fish and Wildlife Fund. The work was carried out by the Department of Marine Resources of the Bahamas (permission: MA & MR / FIS / 17).