HOME >> BIOLOGY >> NEWS
URI oceanographers test method to control metamorphosis in summer flounder

Flounders start life as larvae that live and drift in the coastal ocean. During metamorphosis, their body changes shape, and they move into estuaries and settle to the bottom as juveniles.

Adult flounder represent important commercial and recreational fisheries in Rhode Island waters. A common problem when culturing summer flounder is that faster growing fish metamorphose and settle first and often eat their slower growing siblings. In a recent issue of Aquaculture, URI biological oceanographers Steven Gavlik, Melissa Albino, and Jennifer L. Specker report on a method that addressed this problem through synchronization of growth and settling behavior of metamorphosing summer flounder.

Like the metamorphosis of a tadpole into a frog, flounder metamorphosis is controlled by thyroid hormones. The scientists devised and tested a treatment using thiourea, a naturally occurring thyroid inhibitor found in cabbage, and the thyroid hormone thyroxine. When added to the aquarium water, thiourea and thyroxine are absorbed by the flounder. Thiourea was added when the larvae were one month old. This prevented completion of metamorphosis and inhibited settlement, both of which depend on thyroid hormone.

About two weeks later, the thiourea was removed and thyroxine added. Giving the fish thyroxine in this way is comparable to a person taking a medication, such as Synthroid, to maintain their bodily levels of thyroid hormone. Thyroxine was removed after one week. By the time the flounder were two months old, the growth variability had been reduced, so that fish of the same age were closer in size. The thyroxine addition caused most fish to settle within 3 days, much less than the 2 weeks it normally takes in the culture facility.

The scientists concluded that this sequential thiourea - thyroxine treatment was an effective way to synchronize the settlement and growth of summer flounder. The treatments did not affect the survival of the flounder.
'"/>

Contact: Lisa Cugini
lcugini@gso.uri.edu
401-874-6642
University of Rhode Island
28-May-2002


Page: 1 2

Related biology news :

1. URI oceanographers to build laboratory to study subseafloor life
2. Biological oceanographers examine regime shifts in complex marine ecosystems
3. URI biological oceanographers test shallow marine systems response to increased nutrients
4. URI oceanographers study effects of harmful blooms and red tides on Narragansett Bay
5. URI biological oceanographers study potentially toxic microalgae on the northeast coast
6. University of Rhode Island fisheries oceanographers study the effects of predator-prey interactions in the Georges Bank fish community
7. URI oceanographers receive $900,000 from NSF to study carbon cycling in Arctic Ocean
8. URI biological oceanographers awarded National Science Foundation grant to study increases in jellyfish population
9. URI oceanographers link warmer water temperatures and the decline of winter flounder
10. URI oceanographers discover how planetary waves affect phytoplankton production
11. OHSU researchers discover possible method for early detection, prevention of premature birth

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:1/4/2019)... ... January 03, 2019 , ... Over the ... into their drug discovery research workflows with biology ranging from single cell-type spheroids ... of in vitro studies, they create several challenges that need to be overcome ...
(Date:12/27/2018)... FRANCISCO (PRWEB) , ... December 27, 2018 , ... ... annual Microbiome Conference at JPM as part of the JP Morgan 37th Annual ... innovative scientists and physicians, and members of the investment community. , Since ...
(Date:12/20/2018)... ... December 20, 2018 , ... Human Factors and product ... a new usability/observation room. This addition will help meet the increased industry demand ... delivery devices/combination products are safe and easy to use when released to the ...
Breaking Biology News(10 mins):
(Date:1/10/2019)... Fla. (PRWEB) , ... January ... ... Geometrical Implant Co, (SAGICO), an innovative spinal implant company, announced today that ... in San Francisco, California. The annual J.P. Morgan Healthcare Conference is ...
(Date:1/7/2019)... SEONGNAM, South Korea (PRWEB) , ... January 07, ... ... has completed Phase 1 clinical trials of its Parkinson's Disease drug candidate, code-named ... disease-modifying treatment of Parkinson's Disease. The trial took place in South Korea. ...
(Date:1/4/2019)... ... January 03, 2019 , ... Calidi Biotherapeutics, Inc., ... today announced the founding of a scientific and medical advisory board (SMAB). The ... leaders in the Immuno-Oncology field. The founding members of Calidi Biotherapeutics SMAB include ...
(Date:12/18/2018)... ... December 17, 2018 , ... ABCT ... emerging biosciences ventures invited to participate in the annual program. Twelve ventures will ... plans and a professional network. All startups receive an entrepreneur coach, access to ...
Breaking Biology Technology:
Cached News: