Vengurlo 



EXPLORATORY FISHING BY 

 R.V. VARUNA AND M.V.TUNA 



FEBRUARY -APRIL 1966 



1 POSITIVE STATIONS ( WITH TUNAS) 

 i NEGATIVE STATIONS ( NET FOULED 

 OR NIL CATCH OF TUNAS ) 



NUMBERS INDICATE TUNA CATCH 



IN kg PER OPERATION 



Auxis thazard 



FORK LENGTH ( 



TOTAL NO OF OPERATION : 38 



NO OF POSITIVE STATIONS WITH TUNAS: 10(39-50 HOURS) 



TOTAL CATCH OF TUNAS : 19438 kg 



AVERAGE DURATION OF EACH OPERATION : 3, 95 HOURS 



AVERAGE CATCH OF TUNAS / OPERATION ; 1943-8 kg 



72° 



73» 



74° 



75° 



76° 



Figure 43.— Location of exploratory purse seine sets and catches 

 for tunas by the RV Varuna and MV Tuna off southwestern In- 

 dia and the Laccadive Sea, and the length-frequency distribu- 

 tion and average weight of Aujcis thazard in the catches (Silas 

 1969). (N, = number of fishing operations; >', = number of 

 specimens. 



Figure 44.— The percentage frequencies of the number of Auxis 

 thazard caught per operation, by type of gear, and of the fork lengths 

 of the catches made off the southern and eastern coasts of Sri Lanka 

 (Sivasubramaniam 1968). 



* 109 ISO 200 X 100 



CATCH NUMBER PER OPERATION 



34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 

 FORK LENGTH (cm) 



Figure 45. — Length-frequency distributions 

 of .4uJti8 rochei caught by traps at Barbate, 

 Tarifa, and La Linea. by month and year 

 (1961, 1963, 1964) (Rodriguez-Roda 1966). 



28 32 36 40 



FORK LENGTH (cm) 



46 



