20 -i 



2 10 H 



re 



u 



0-. 



o 



D D 



•9 



DO" 



x none collected 



o a° 



20 



40 



~m 



~~m 



100 



Depth |m) 



FIGURE 2. 



-Mean caixhtow (numbers) of Squilhi empusa by 

 depth for each sex. 



cruises were made each month, was 6.79 during 

 the day but 23.93 at night. The difference is sig- 

 nificant at a - 0.01 using a one-way analysis of 

 variance {F = 15.13; 22 df), even though this sim- 

 ple model maximizes the error mean square in 

 comparison to more complex models. 



Size at Maturity and Spawning Periodicity 



Squilla empusa begin to mature at 70 mm. No 

 individuals <70 mm were in Early-Developing, 

 Late-Developing, or Gravid stages (Fig. 4). Only a 

 small fraction of all Gravid females (15%) were 

 70-80 mm, but half were gravid by 90 mm. There 

 was little difference in size between individuals in 

 the Early-Developing, Late-Developing, or Gravid 

 stages, respective means being 88, 90, and 91 mm. 



Spawning apparently occurs over an 8-mo 

 period that begins in January and ends in July- 

 August. Few or no Early-Developing, Late- 

 Developing, or Gravid individuals were captured 

 from September through December either year 

 (Fig. 5). Individuals in these stages were abundant 

 in January and remained so through July- August. 

 Immature and Spent or Resting individuals 

 greatly predominated during the period 

 September-December each year. 



50 



50 



I00n 



50- 



25-. 



25 -, 



36 -47m 

 n = 50 



55 - 100m 



n = 28 



20 



a , aAA^V 



60 



36 - 47m 

 n = 35 



55 - 100m 

 n = 27 



20 



»ww. , * 



60 



100 140 



Total Length (mm) 



FIGURE 3. — Length frequencies of Squilla empusa by depth for each sex. 



100 



140 



421 



