Navigation Links
Poisonous Poisson
Date:12/5/2009

In contrast to the exhaustive research into venom produced by snakes and spiders, venomous fish have been neglected and remain something of a mystery. Now, a study of 158 catfish species, published in the open access journal BMC Evolutionary Biology, has catalogued the presence of venom glands and investigated their biological effects.

Jeremy Wright, from the University of Michigan, USA, carried out the investigation. He said, "I used histological and toxicological techniques to elucidate the diversity and distribution of venomous catfish. I found that at least 1250, and possibly over 1600 species of catfish may be venomous, a number far greater than any previous estimate of venomous catfish diversity"

Catfish venom glands are found in association with sharp, bony spines along the leading edge of the dorsal and pectoral fins, which can be locked into place when the catfish is threatened. When a spine enters a potential predator, the membrane surrounding the venom gland cells is torn, releasing venom into the wound. Wright describes how catfish venoms are neurotoxic and hemolytic, and are capable of producing a variety of effects such as severe pain, ischemia, muscle spasm and respiratory distress. However, as any one species examined produces no more than three distinct toxins in its venom, each species may not display all of these properties.

Wright's analyses indicate that there are at least two independent evolutionary origins of catfish venom glands. In addition, the toxic peptides show strong similarities with, and might be derived from, previously characterized toxins found in catfish epidermal secretions. "Further examination of the chemical composition of the venoms will provide valuable insight into the mechanisms and potential selective factors driving venom evolution in fishes", comments Wright.


'/>"/>

Contact: Graeme Baldwin
graeme.baldwin@biomedcentral.com
44-020-319-22165
BioMed Central
Source:Eurekalert  

Page: 1

Related biology news :

1. CU researcher engineers sorghum that grows in poisonous soils
2. Genetic technology reveals how poisonous mushrooms cook up toxins
3. Researchers develop new ultrasensitive assay to detect most poisonous substance known
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Poisonous Poisson
(Date:4/4/2017)... April 4, 2017   EyeLock LLC , a ... the United States Patent and Trademark Office (USPTO) has ... the linking of an iris image with a face ... represents the company,s 45 th issued patent. ... very timely given the multi-modal biometric capabilities that have ...
(Date:3/29/2017)...  higi, the health IT company that operates the ... , today announced a Series B investment from ... The new investment and acquisition accelerates higi,s strategy to ... population health activities through the collection and workflow integration ... collects and secures data today on behalf of over ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based and ... 2022", published by MarketsandMarkets, the market is expected to be worth USD 18.98 ... Continue Reading ... ...      ...
Breaking Biology News(10 mins):
(Date:4/26/2017)... , April 26, 2017  Genisphere LLC, provider ... has signed a collaborative and sponsored research agreement ... Silvia Muro . The overall goal of the ... of various 3DNA designs and formulations after ... diseases of the vasculature as well as inflammatory ...
(Date:4/25/2017)... ... 25, 2017 , ... L3 Clinical Trials, the Clinical Research ... now a certified iMedNet eClinical and Electronic Data Capture software designer for clinical ... team to build, customize and manage clinical trial data capture and databases for ...
(Date:4/25/2017)... ... April 25, 2017 , ... Covalent Metrology ... Analytical Services unit provides high-quality data to clients, both faster and ... of receipt. There are no price premiums, and customers are welcome to participate ...
(Date:4/24/2017)... 2017  Dante Labs announced today the offer of whole ... $900). While American individuals have been able to access WGS ... access WGS below EUR 1,000. The sequencing includes ... information to make informed decisions about disease monitoring, prevention, nutrition, ... ...
Breaking Biology Technology: