734 



Fishery Bulletin 89(4). 1991 



Regression analysis techniques (Gulland 

 1969) were used to estimate the average 

 annual survival rate for each tagging 

 year by grouping returns into 12-month 

 intervals beginning with month of release 

 (December-March for the Gulf of Mexico 

 group, and May- June for the Atlantic 

 group) (Table 2). Fish recaptured within 

 30 days of release were not included in 

 our analysis, which allowed tagged fish 

 to recover from tagging and reduced the 

 effect of short-term tagging mortality on 

 our estimates of survival rate. Only the 

 Gulf stock had sufficient numbers of 

 recaptured fish to use the method of 

 Brownie et al. (1985) to estimate annual 

 survival. 



25 



20 



< 



M GULF (N=9010) 

 ED ATLANTIC (N = 3483) 



37.5 52.5 67.5 82.5 97.5 112.5 127.5 

 FORK LENGTH (cm)-RELEASE 



M GULF (N=439) 

 CD ATLANTIC (N=157) 



FORK LENGTH (cm)-RECAPTURE 



Figure 1 



Length-frequencies of king mackerel Scomberornorus cavalla 

 at release and recapture from Gulf of Mexico and Atlantic 

 migratory groups. Fish were grouped by 50 mm FL intervals; 

 mid-range values are used for each plot. 



> 



LU 





o 

 a: 



RSFWRSFWRSFWRSFWRS FWRSFWRSFW 



20 



15-- 



ATLANTIC MIGRATORY GROUP 

 (N=157) 



SFWR SFWRSFWRSFWRSFWRSFWRSFWR 



YEARS-AT-LARGE 

 Figure 2 



Recaptured king mackerel Scomberornorus cavalla utilized in 

 the growth analysis, summarized by 30-day blocks from time 

 of tagging, for the Gulf of Mexico (released during December- 

 March) and Atlantic (released during May-June) migratory 

 groups. Seasons for each year of recapture are: W = winter, 

 R = spring, S = summer, and F = fall. 



