Brule et al. : Reproduction in Mycteroperca bonaa 



471 



100 



« 75 



50 



25- 



112 81 15 



n = 895 



1-50 = 72.1 cm 50 



53 /• 



_L 



25 50 75 100 



Fork length (cm) 



125 



Figure 7 



Percent of mature females at length for black grou- 

 per (Mycteroperca bonaci) from inshore and offshore 

 waters of the Campeche Bank and shallow waters of 

 Alacranes Reef, Mexico (April 1996-February 2000). 

 Proportion of sexually mature females within each 

 size class is plotted with a binary logistic regression. 

 Line indicates length at SO'/c maturity (Lj,,). Number 

 of fish sampled is given for each size class. 



20 40 60 80 100 120 140 

 Fork length (cm) 



Figure 8 



Percentage of female black grouper (Mycteroperca 

 bonaci) as a function of fork length. Samples were 

 taken between April 1996 and February 2000 in 

 inshore and offshore waters of the Campeche Bank 

 and shallow waters of Alacranes Reef Mexico. Pjo is 

 the length predicted by binary logistic regression at 

 which 50% of the sampled black grouper are female. 

 Number offish sampled is given for each size class. 



females than for males. According to Sadovy ( 1996), ovaries 

 best reflect duration of fish spawning activity. Under this 

 assumption, the length of the black grouper spawning 

 season was evaluated by using Sadovy 's criteria (1996) as 



defined to assess the duration of annual spawning in reef 

 fish species. Spawning season for black grouper from the 

 Campeche Bank was shown to extend from December to 

 March — a spawning month being defined as one in which 



