324 



Fishery Bulletin 88(2|. 1990 



Figure 1 



Cape Egg and Larval Programme (CELP) survey grid, southern Benguela Current region, sampled monthly 

 August 1977-August 1978, and general topography of the survey area (depth contours in meters). 



tioned at 10-nautical-mile intervals (18.5 km) on 20 

 transects (Fig. 1). 



Vertical profiles of temperature and water samples 

 for measurement of salinity, chlorophyll-a concentra- 

 tion, and microplankton density were collected from 

 the water column. Chlorophyll analysis, described in 

 Shannon et al. (1984), was by means the standard 

 photometric method of SCOR/UNESCO Working 

 Group 17 (1966). Microplankton particle concentration 

 was determined by prefiltering 2 liters of the water 

 sample through a 100-/im filter and collecting those 

 particles retained by a 37-;.(m filter. Particles between 

 37 and 100 ^m correspond to the size fraction consid- 

 ered to be important for first-feeding anchovy larvae 

 (Arthur 1976, Hunter 1977). Particles were counted 

 under a light microscope at 20 x magnification and ex- 

 pressed as number per liter. Although all particles were 

 enumerated, only the maximum density at each station 

 of total "esculent" (nutritious to fish larvae [Sharp 

 1980]) particles are presented, such as copepod eggs, 

 nauplii, copepodite stages, and dinoflagellates. Wind 

 strength and direction were estimated by the light- 



house keeper at Cape Point throughout the period. In 

 order to examine surface drift patterns, 20 plastic drift 

 cards (Dimcan 1965) were released monthly at each sta- 

 tion sampled. 



Fish eggs and larvae were sampled by means of a 

 double oblique haul of a Bongo sampler down to a max- 

 imum depth of 100 m. The sampler had a mouth open- 

 ing of 57 cm and was fitted with 300-^m and 500-/im 

 mesh nets. Counts of anchovy eggs and larvae from 

 the 300-f4m unit were standardized to volume or num- 

 bers under 10 m^ using the formula given in Smith 

 and Richardson (1977). In November 1979 and Novem- 

 ber 1984 the vertical distribution of anchovy eggs and 

 temperature profiles was measured at two localities. 

 Eggs were sampled with Miller nets (Miller 1961) as 

 described in Shelton and Hutchings (1982). Anchovy 

 egg and early-stage larval abundance data from a more 

 extensive grid of stations sampled in November 1983 

 using a CalVET net (Smith et al. 1985) are also 

 presented. 



