Requiem sharks, such as Atlantic sharpnose shark (Rhizoprionodon terraenovae) and sandbar shark (Carcharhinus plumbeus), nurse shark (Ginglymostoma cirratum), lemon shark (Negaprion brevirostris) and bonnethead shark (Sphyrna tiburo).

For this and several other compartments, standing biomass was estimated using harvest data from the National Parks Service angler monitoring efforts. These catch numbers were used to determine the amount harvested from Florida Bay, and thenn, based on a series of assumptions, the biomass was estimated. This page will detail the methodology used in this process. In the subsequnet pages that used these methods, total catch, and not total harvest, was used. This was based on the assumption that recreational harvest most likely underutilizes the production of each species, and that the total catch is probably a better reflection of total biomass.

  Tilmant 1989,  Schmidt et al. 1997.

  Schmidt unpublished.

  Cantillo et al. 1995.

  Schmidt 1979,  Carrier and Luer 1990,  Gruber. 1982.

Production Estimate

Assumes production equals twice the harvest rate

  Baird and Ulanowicz 1989.

  Jorgensen et al. 1991.

Once annual production was estimated in the above process, it was scaled according to the seasonal production variability determined in Venier 1997.

  Arreguin-Sanchez et al. 1993,  Venier 1997.

  Parson 1990.

(see Detritivorous Gastropods in this network for methods used to determine these values.)

  Jorgensen et al. 1991,  McNeil and Lawton 1970,  Humphreys 1979,  Thayer et al. 1973.

Consumption is determined by using consumption to biomass ratios:

  Arreguin-Sanchez et al. 1993,  Wetherbee 1990,  Gruber 1982.

Egestion has been calculated using the other parameters : E=C-P-R

  Schmidt 1986,  Wetherbee 1990,  Gruber 1982,  Cortes et al 1996,  Robbins 1986.

These values were determined from the estimated harvest numbers in the Biomass Section.

  Schmidt unpublished,  FLDEP 1997.