SQUIRE: PELAGIC MARINE FISHES OFF SOUTHERN AND CENTRAL CALIFORNIA 



Table 1. — Species of fish and other marine animals 

 observed during surveys. 



Fish: 



Basking shark (Cetorhinus maximus) 

 White shark (Carcharodon carcharias) 

 Northern anchovy (Engraulis mordax) 

 Pacific sardine (Sardinops sagax) 

 Pacific bonito (Sarda chiliensis) 

 Jack mackerel (Trachurus symmttricus) 

 Pacific mackerel (Scomber japonicus) 

 Pacific barracuda (Sphyrama argentta) 

 Yellowtail (Siriola dorsalis) 

 Whita seobass (Cynoscion nobilis) 

 Bluefin tuna (Thunnus thynnus) 

 Albacora tuna (Thunnus atalunga) 

 Yeliowfin tuna (Thunnus albacares) 

 Skipjack tuna (Katsuwonus pelamis) 

 Jacksmelt (Atherinopsis calijornimsis) 

 Ocean sunfish (Mola mola) 

 Striped bass (Morone saxatilis) 

 Pacific saury (Cololabis saira) 

 Swordfish (Xiphias gladius) 

 Striped marlin (Tttrapturus audax) 



Mammals: 

 Gray whale 

 Pilot whole 



Blackfish (killer whale) 

 Porpoise and dolphin 

 Seals and sea lions 



Invertebrates: 

 Squid 

 Jellyfish 



or night) might be the more significant in eval- 

 uating the trend of apparent abundance. These 

 data were calculated during an earlier part of 

 the study (1962-1966) to evaluate the method 

 of using aerial fish spotter data. 



The total amount of fish estimated to have been 

 seen by the aerial fish spotters during the period 

 1962-1966 was 5,289,521 tons of the following 

 species: northern anchovy, 4,550,218 tons; jack 

 mackerel, 335,794 tons; Pacific bonito, 238,247 

 tons; Pacific mackerel, 103,464 tons; and yel- 

 lowtail, 1,955 tons. 



Annual sightings of each species per block 

 area flight were expressed as a percentage of 

 all block area flights day and night (% day/ 

 % night) and are shown in Table 3. The ratio 

 of diurnal and nocturnal sightings was obtained 

 by dividing the percentage of day sightings by 

 the percentage of night sightings. Ratio values 

 greater than 1.00 indicate a greater number of 

 sightings during day, less than 1.00 indicate 

 greater number of sightings during the night. 



To determine the day and night diff'erences in 

 the tonnage observed for each species, the 



Table 2. — Observation effort (day/night) in block area flights by zone for the period September 1962 through 1969. 



[Data are presented in number of block area flights (day/night).] 



Table 3. — Annual sightings per block area flight in percentage (day/night) and day/night averages and ratios. 



Species 



1962 



1963 



1964 



1965 



1966 



Day/night 



Average 



Ratio 



8.7/19.7 



7.3/ 5.1 



3,5/ 9.9 



4.2/ 9.6 



1.5/ 2.3 



1.0/ 0.4 



0.9/ 0.6 



7.8/21.5 



9.7/ 3.4 



5.0/ 6.7 



2.0/ 3.5 



0.8/ 2.1 



0.2/ 0.0 



0.5/ 0.6 



4.9/11.8 



8.3/ 1.7 



3.3/ 6.2 



0.3/ 1.2 



0.1/ 0.4 



0.2/ 0.0 



0.7/ 0.0 



5.4/25.0 



6.3/ 2.5 



1.8/ 5.7 



0.1/ 2.0 



0.2/ 0.4 



0.2/ 0.0 



0.2/ 0.1 



6.0/19.9 

 7.5/ 3.8 

 2.7/ 6.1 

 1.3/ 4.6 

 0.7/ 1.3 

 0.3/ 0.0 

 0.8/ 0.2 



0.30 

 1.99 

 0.47 

 0.28 

 0.57 

 4.00 

 3.15 



1011 



