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Fishnet Bank
Fishnet Bank is a small, nearly circular bank located at 28.15°N and 91.81°W near Eugene Island. It is a ‘transitional’ mid-shelf bank composed of tertiary limestones, sandstones, claystones and siltstones. It is most similar in biotic structure to the South Texas mid-shelf banks, which though of different geologic origin, arise from approximately the same depths. Marine life incident at the banks include small fishes, crustaceans and other invertebrates. Location on Continental Shelf: Mid-Shelf Bank Coordinates: 28.15° N 91.81° W Nearest Largest City: New Orleans, Louisiana, USA Selected Characteristics: Area of Coverage: 2 km2 Minimum Depth: 60 m Maximum Depth: 70-80 m Community Structure: Where the soft bottom consists of substantial amounts of sand, shell and gravel there is a predominance of antipatharian whips, comatulid crinoids, large asteroids and urchins. Populations of small benthic fishes, minutes crustaceans and small anomurans are common. Most of the larger fishes are associated with the hard bottom. These include yellowtail reef fish and schools of vermillion snapper. Corals, coralline algae and sponges cover most of the rock outcrops or their upper surfaces. Those parts of the rocks not covered by these are generally laden with sediment veneers or a sediment-epifauna mat. Geological Characterization: Fishnet Bank is referred to as a ‘transitional’ bank with surrounding depths in excess of 65 m but less than 80 m on all sides of the bank. It has a relatively flat crest that lies at depths of 66 to 70 m. A raised rim along its southeastern and southern margins may be a reef build up. Three separate peaks on the rim attain minimum depths of just greater than 60 m. Two patterns of local relief are found atop Fishnet Bank: A pattern along its southern and south eastern perimeter, which may be a fringing reef but is more likely an outcrop of a more massive rock unit, and an ellipsoidal pattern of outcrops that result from the truncation of the domal uplift. The fringing reef or outcrop of massive rock occupies the break in slope at the margins of the bank’s almost flat top. Most of the bottom consists of substantial amounts of sand, shell and gravel with occasional large boulders. References: Rezak, R., T.J. Bright and D.W. McGrail. 1985. Reefs and Banks of the Northwestern Gulf of Mexico: : their geological, biological, and physical dynamics. Wiley, New York, NY, USA, 259 p. Keywords: Bank, Transitonal, Coralline algae,Sponge, Crustacean |
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GulfBase is a project of the
Harte
Research Institute for Gulf of Mexico Studies at Texas A&M University-Corpus Christi.
To give proper credit to the original authors, please cite information taken from GulfBase by the original source as displayed. 
To cite GulfBase, use:
M. Nipper, J.A. Sánchez Chávez,
and J.W. Tunnell, Jr., Editors. 2010.
GulfBase: Resource Database for Gulf of Mexico Research.
World Wide
Web electronic publication. http://www.gulfbase.org, 29 July 2010. |
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