When it's summer, get ready for chondrichthyes! CREATURE FEATURE: brown smooth-hound

When it's summer, get ready for chondrichthyes! CREATURE FEATURE: brown smooth-hound

Updated: Aug 7, 2018

During the spring and summer seasons, we see an increase of cartilaginous fish populations in the SF Bay. This week's creature is the brown smooth-hound



The brown smooth-hound (Mustelus henlei ) is a common, abundant cartilaginous fish we find in the San Francisco Bay. Brown smooth-hounds are viviparous species, meaning embryos are nourished through a yolk-sac placenta while developing inside the mother shark's body. At Marine Science Institute, we witness lots of incredible animal activity and phenomena, including...

shark pup births! (pictured right)


Brown smooth-hound litter counts can range between 1-21 pups, but the average is 3-5 pups per litter. These young sharks measure between 7.5-11.8 inches in length at birth. Sexual maturity is reached when they measure between 1.6-2.3 feet, and at this length, they could be anywhere between 2-4 years old. Although mature brown smooth-hound sharks average at 2 feet, they can grow over 3 feet in length.


These small, slender bodied sharks are present in coastal waters of the eastern Pacific Ocean and prefer the muddy, sandy bottoms of bays. In California, there are local populations present in Humbolt, Tomales and San Francisco Bays. Being bottom dwelling sharks, they prey on a variety of animals that you might also find at the bottom such as crabs, shrimps, isopods, worms and tunicates. As adults, they add more bony fish to their diet such as gobies and flatfish.


Are there animals in the San Francisco Bay that prey on brown smooth-hounds?

Yes! In fact, last week's featured creature, the broadnose sevengill shark (Notorynchus cepedianus) is a known predator of the brown smooth-hound.


Produced and Edited by Naomi Deal

__________________________________________________________________________________

Resources and References:

  • Bester, Cathleen. Mustelus henlei . Ichthyology Collection. Dickinson Hall Florida Museum. University of Florida. 2018. https://www.floridamuseum.ufl.edu/fish/discover/species-profiles/mustelus-henlei/ July 2018.

  • Pérez-Jiménez, J., Carlisle, A.B., Chabot, C.L., Vásquez, V.E. & Ebert, D.A. 2016. Mustelus henlei. The IUCN Red List of Threatened Species 2016: e.T161648A80672263. http://dx.doi.org/10.2305/IUCN.UK.2016-2.RLTS.T161648A80672263.en. July 2018.

0 views

Subscribe for Updates

ADDRESS

500 Discovery Parkway

Redwood City, CA 94063

info@sfbaymsi.org

Tel: 650-364-2760

Click here for directions

facebook fish logo.png
instagram.png
Twitter fish logo.png
linkin.png

Marine Science Institute is a tax-exempt 501(c)(3) not for profit organization © 2019 All Rights Reserved  

Inspiring respect and stewardship for the marine environment through experiential learning

Thank you to our generous supporters who donated more than $25,000