IVERSEN ET AL.: BIOLOGICAL DATA ON QUEEN CONCHS 



o 



LU 



o 



LU 

 CC 

 LJL 



14 



12 



10 



LnTLi; WHALE CAY (N = 184) 

 MAY. JUNE, AUG &. SEFI 1980 



BOND CAY CHANNEL (N = 175) 

 APRIL 19B0. APRIL & OCT 1981 



V 



40 60 80 100 120 140 160 180 200 220 240 260 



SHELL LENGTH CLASS MIDPOINTS Cmm) 



Figure 2.— Shell length distribution of queen conchs in the Berry Islands. 



Table 1 .—Size-frequency distribution of queen conch at Little Cockroach Cay (May 1980-April 1981). 



'No data. 



Channel, X = 19.6 ± 2.6 conchs/10 m^, followed 

 by Vigilant Cay west, X =_13.5 + 3.1 conchs/10 

 m^, and Vigilant Cay east, X = 12.2 + 2.9 conchs/ 

 10 m-. Lowest mean densities were found at Little 

 Cockroach Cay, X = 1.5 ± 0.7 conchs/10 m^ and 

 Little Whale Cay north, Z = 3.3 ± 0.7 conchs/10 

 m2 (Table 2). 

 The mean queen conch density for all locations 



combined varied between June, September, and 

 November. Density was highest in June {X = 9.9 

 ± 0.3_conchs/10 m^, N = 978) followed by Novem- 

 ber (X = 6.7 ± 0.4 conchs/10 m^, A^ = 673) and 

 September {X = 6.0 ± 0.3 conchs/10 m^; N = 722). 

 Queen conchs were randomly distributed over the 

 100 m transect at all locations except Cat Cay and 

 Vigilant Cay, according to the results of a serial ran- 



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