FISHERY BULLETIN: VOL. 82, NO. 1 



X 

 (- 

 Q. 



10 20 30 40 50 60 70 80 



MEAN NUMERICAL DENSITY 

 (Number/lOOOm 3 ) 



','« 



Q. 

 LU 



Q 



5 10 



MEAN BIOMASS DENSITY 

 (kg/1000m 3 ) 



FIGURE 4. — Vertical distribution of the numerical densities of all 

 resident teleosts in two areas within the San Onofre kelp bed during 

 fall 1979. Points are mean densities over sampling dates at each site 

 and stratum, and bars represent one standard error of the mean. 



FIGURE 5. — Vertical distributions of the biomass density of all resi- 

 dent teleosts in two areas within the San Onofre kelp forest during 

 fall 1979. Points are mean densities over sampling dates at each site 

 and stratum, and bars represent one standard error of the mean. 



various embiotocids compensated for the decline in 

 abundance of senorita (Tables 6, 7). The higher 

 numerical densities of these large fishes on the bot- 

 tom contributed most to the peak biomass densities 

 in this stratum. 



Weighting densities for the size of stratum, we 

 estimated that on average about 40 and 46 fish 

 occurred over 100 m 2 at SOK-U and SOK-D, respec- 

 tively, with corresponding biomass values of 3.9 and 

 6.5 kg/100 m 2 (Table 11). About 66% (SOK-D) to 



77% (SOK-U) of all individuals occurred in the upper 

 two strata, 9% (SOK-U) to 14% (SOK-D) at 12 m, and 

 14% (SOK-U) to 19% (SOK-D) on the bottom. The 

 small vertical extent of the bottom stratum 

 diminished its contribution to the abundance offish 

 integrated over the entire water column. About 44- 

 45% offish biomass occurred in the two upper strata, 

 15% (SOK-U) to 22% (SOK-D) occurred at 12 m, and 

 34% (SOK-D) to 40% (SOK-U) on the bottom. Thus 

 much of biomass was near the bottom, but because of 



Table 1 1. — Abundance of resident teleosts, based on densities integrated through the water column over 100 m 2 

 of bottom. The standing stock in numbers and biomass is given for each of two areas (SOK-U and SOK-D) within 

 the San Onofre kelp bed, and for an adjacent area of cobble bottom with little kelp (Cobble), for samples taken in 

 fall 1979. 



48 



