Counting fish in the kelp forests of Baja California
- Research Team Head
- Data Manager
- Date Collected
- 2011-09-10 to 2013-12-05
Fish densities obtained from ecological surveys that aims on assess changes on the fish communities associated with the kelp forest ecosystem, using visual censuses with scuba dive equipment by researches and students of the Universidad Autonoma de Baja California, Ensenada.
The sampling consisted of underwater visual censuses performed by scuba divers carrying out belt transects of 30 meters length (verified with tape measure) and a window of 2x2 meters of amplitude (30 × 2 m, assessment unit: 60 m2). For each locality, 6 transects were done, three in the benthic zone, and three in the midwater zone. The midwater position was weighted by the depth of the sampling site; 4-6 m from the bottom if the depth in the site is less than 10 m and 6-8 m if the depth is greater than 10 m. Transects were made trying to keep the same direction and speed, and changing direction between transects to avoid pseudoreplicate. To record the species and their sizes, acrylic boards and plastic paper (Duracopy) were used. All transects were performed between 08:00 a.m. to 2:00 p.m.
Fish species, abundance and fish sizes (2011= size classes 0-15cm, 15-30cm, 30-or more; 2012=no size classes; 2-2013= 5cm size classes)
- Scope And Content
The data described here have been embargoed until 2020-01-01. Inquiries should be directed to Arturo Ramirez-Valdez (firstname.lastname@example.org).
- Technical Details
Software used: Microsoft Excel. Coordinate system: WGS 1984.
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