新澳门六合彩内幕信息

Ultrasounds for Abalone

Ultrasounds Proven an Effective, Hands-off Way to Help Spawn Endangered Abalone

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A woman's hand is seen giving an ultrasound to an abalone in a tank with sonagraph on computer screen in background
Sara Boles of 新澳门六合彩内幕信息 Davis鈥 Bodega Marine Laboratory gives an ultrasound to an abalone as part of efforts to help abalone more successfully spawn for aquaculture and conservation. (Jackson Gross/新澳门六合彩内幕信息 Davis)

The world鈥檚 abalone are threatened, endangered or otherwise vulnerable in nearly every corner of the planet. While captive breeding efforts are underway for some species, these giant sea snails are notoriously difficult to spawn. If only we could wave a magic wand to know when abalone are ready to reproduce, without even touching them. 

Scientists from the University of California, Davis, found that wand 鈥 although it isn鈥檛 magic, and it only looks like a wand. It鈥檚 an ultrasound transducer,  and it can be used to quickly and noninvasively detect when abalone are ready to spawn, according to published in the journal Frontiers in Marine Science.

The technique is expected to help abalone farmers and captive breeding managers produce more abalone, with minimal stress to the animal. 

Woman scientist gives ultrasound to an abalone in a tank at a marine lab
新澳门六合彩内幕信息 Davis postdoctoral researcher Sara Boles gives an abalone an ultrasound through its tank at the Bodega Marine Laboratory. (Jackson Gross/新澳门六合彩内幕信息 Davis)

Increasing abalone welfare

Abalone suction onto surfaces and typically have to be pried off for gonad inspection before spawning. For these animals 鈥 particularly endangered abalone 鈥 the less they are handled, the less opportunity for stress or physical harm. 

鈥淭here are not a lot of animal welfare methods applied to invertebrate animals, let alone for aquatic species,鈥 said corresponding author Jackson Gross, an assistant professor of with the 新澳门六合彩内幕信息 Davis Department of Animal Science. 鈥淗ere鈥檚 a way to increase the welfare of an abalone without bringing added stress to them.鈥 

The United States Navy鈥檚 Pacific Fleet funded the research as part of its efforts to conserve federally endangered black abalone and find better ways to assess their reproductive health. Because of black abalones鈥 low numbers and high vulnerability, the authors used closely related farmed red abalone to test the effectiveness of ultrasounds on abalone. 

Gross had used the technique for gonad assessments on sturgeon and catfish, but it had never been tested for sea snails until this study. When Gross saw a video of a veterinarian in Scotland conducting an ultrasound on a large land snail, he felt certain it would work for abalone.

adult red abalone held in hands
Farmed and captive-raised red abalone served as a proxy for endangered black abalone in 新澳门六合彩内幕信息 Davis experiments to test if ultrasounds could be an effective, noninvasive means of assessing abalone鈥檚 reproductive health. (Jackson Gross/新澳门六合彩内幕信息 Davis)

Testing the tech

With Gross鈥 background, the extensive knowledge of the at the 新澳门六合彩内幕信息 Davis Bodega Marine Laboratory, and first author Sara Boles鈥 experience studying red abalone, the authors tested the method on 12 farm-raised red abalone and about 100 red abalone raised at Bodega Marine Lab. They monitored the lab-raised abalone for seven weeks to detect seasonal changes in their gonad size.

They found that ultrasounds could differentiate reproductive tissues from digestive tissues. They were then able to create a gonad index score ranging from 1 to 5 that indicates the abalones鈥 readiness to reproduce. Abalone measuring in the 3 to 5 range could be ideal candidates for spawning. They also found the technology was sensitive enough to detect changes both before and after spawning.

鈥淭his is very helpful for broodstock managers when trying to select individuals for a spawning season, whether for production aquaculture or conservation,鈥 said Boles, a postdoctoral researcher with the 新澳门六合彩内幕信息 Davis Coastal and Marine Sciences Institute at the Bodega Marine Laboratory.

How to give abalone an ultrasound

So how do you ultrasound an abalone? It鈥檚 fairly straightforward. 

You submerge the abalone underwater in its tank and place the ultrasound transducer on the outside of the tank by the abalone鈥檚 foot. The sound passes through the tank and transmits the image.

Routine assessments using ultrasounds can be conducted without touching the animal at all. Abalone do still have to be handled for spawning events, but ultrasounds can minimize the handling involved.

新澳门六合彩内幕信息 Davis Aquaculture gives viewers a tour of the 新澳门六合彩内幕信息 Davis Bodega Marine Laboratory to watch Dr. Sara Boles conduct ultrasound examinations of red abalone. (新澳门六合彩内幕信息 Davis Aquaculture Cooperative Extension)

Abalone are an ecologically and culturally important keystone species for California鈥檚 coastal ecosystem. They face multiple, often intertwining threats 鈥 from warming ocean temperatures and disease to crashing kelp forests and habitat degradation.

鈥淲e鈥檙e excited to see how much faster we can use this technology to assess the health of these animals, especially in a world where climate change is making an impact,鈥 Gross said.

The study鈥檚 co-authors include Isabelle Neylan and Laura Rogers-Bennett of 新澳门六合彩内幕信息 Davis.

Media Resources

Media Contacts:

  • Jackson Gross, 新澳门六合彩内幕信息 Davis Animal Science, jagross@ucdavis.edu
  • Sara Boles, 新澳门六合彩内幕信息 Davis Coastal and Marine Sciences Institute, seboles@ucdavis.edu
  • Kat Kerlin, 新澳门六合彩内幕信息 Davis News and Media Relations, 530-750-9195, kekerlin@ucdavis.edu 

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