33°30 



33=00 



32° 30' 



32°00' 



IIS-SO 



IIS-OO' 



II7»30' 



Figure 5. — Catch distribution for October 1963 through 

 1967. 



Table 2. — Mean catch temperatures and numbers of 

 striped marlin landed at the San Diego Marlin Club; Au- 

 gust, September, October 1963 through 1967. Mean 

 temperatures calculated from subjective temperature data 

 and catch data for each 10-minute longitude by latitude 

 block area. 



TCMPERATURC ("Fl 



Figure 6. — Distribution of striped marlin catch by sea 

 surt'ace temperature showing the mean (.r), standard de- 

 viation (5), and range (R) of temperatures for all catches 

 landed at the San Diego Marlin Club, California 

 (1963-1967). 



(0.36° C). From these isotherm charts a sea surface 

 temperature value was estimated for each 

 10-minute block area where fish were caught as 

 shown in Figures 3-5. Using these temperature data 

 and the catch distribution data for the 10-minute 

 block area, mean catch-temperature^ figures were 

 computed for striped marlin landed in August, Sep- 

 tember, and October for the period 1963-1967 

 (Table 2). Mean catch-temperatures by month for 

 all fish landed were: August, 67.8° F (19.9° C); Sep- 

 tember. 68.0° F (20.0°C); and October, 67.3° F 

 (19.6°C). Temperatures at which striped marlin 

 were caught ranged from 61 .0° F (16. 1° C) to 73.0° F 

 (22.8° C) with a mean overall catch temperature of 

 67.8° F (19.9° C) and a standard deviation of 0.5° F 

 (0.9° C). The distribution of the catch relative to 

 temperature for all catches is shown in Figure 6. 



OBSERVATIONS OF 



TEMPERATURE ISOTHERMS 



OFF SAN DIEGO AND 



BAJA CALIFORNIA 



RELATIVE TO FISHING SUCCESS 



For comparison of marlin catch to sea surface 

 temperature for the period 1963 to 1970, tempera- 

 ture data for the area from southern California to off 



- Each striped marlin had a temperature value associated with 

 it; the mean catch-temperature was computed by summing the 

 temperature values and dividing by the total number of entries. 



191 



