Ecology of Pelagic Amphipoda, II — Brusca 
451 
TABLE 3 
Seasonal Variations in the Percentages of Mature Females Carrying Ova (O), Carrying 
Young (Y), Mean Size (MS), Size Range (SR), Female/Male Ratio (f/m), and the 
Average Number per Trawl Hour (n/th) Based on Positive Samples 
for Cyphocaris richardi 
SEASON 
O 
Y 
MS (mm) 
SR(mm) 
f/m 
n/th 
Summer 
10% 
0% 
20 
11-29 
1.5/1 
33 
Fall 
43% 
0% 
22 
17-28 
0.7/1 
56 
Winter 
10% 
13% 
26 
18-33 
1/1 
51 
Spring 
14% 
0% 
24 
15-30 
1.6/1 
48 
TABLE 4 
Seasonal Variation in the Percentages of Mature Females Carrying Ova (O) and 
Young (Y), Mean Size (MS), and Size Range (SR), and Average Number per Trawl 
Hour (n/th) for Eupronoe minuta 
SEASON 
O 
Y 
MS (mm) 
SR (mm) 
n/th 
Summer 
35% 
15% 
6 
4. 2-7.8 
4 
Fall 
26% 
0% 
5.5 
3-7.5 
26 
Winter 
10% 
0% 
5.5 
3. 5-7.5 
8 
Spring 
25% 
15% 
5.7 
5-7 
5 
TABLE 5 
Seasonal Variation in the Percentages of Mature Females Carrying Ova (O), and 
Young (Y), Mean Size of Females (MSf), and Males (MSm), Size Range of 
Females (SRf), and Males (SRm), and Average Number per Trawl 
Hour (n/th) for Primno macropa 
SEASON 
O 
Y 
MSf 
MSm 
SRf (mm) 
SRm (mm) 
n/th 
Summer 
50% 
5% 
7 
5 
4-12 
4-9 
5 
Fall 
50% 
3% 
8.5 
4.5 
4-12 
4-5 
26 
Winter 
33% 
0% 
7 
none 
5-13 
none 
4 
Spring 
27% 
25% 
12 
none 
6-14 
none 
4 
summer and fall months, with a high percentage 
of the females carrying young by spring. Males 
were captured only during times of highest ova 
production. The young were released into the 
adult population during the summer, as indi- 
cated by a drop in mean size, an extension of 
the lower limit of the size range, and an in- 
crease in the average number per trawl hour by 
the fall months. 
Family cystisomidae 
Cystisoma fabricii Stebbing 
Only 31 specimens were collected. Ovigerous 
females were noted in October and December, 
and some were carrying young during January 
and August. There was an increase in the num- 
ber of males collected at times of ova produc- 
tion. Because of the paucity of specimens no 
definite conclusions can be drawn. 
Cystisoma pellucidum (Suhn) 
Only 4 individuals were collected during the 
entire study period, including a single ovigerous 
female in July (64 mm). Other specimens were 
taken in August (male, 70 mm), January 
(male, 116 mm), and May (damaged, 70 mm). 
Family oxycephalidae 
Calamorhynchus pellucidus Streets 
A single male specimen (19 mm) was col- 
lected during September. Fage (I960) gave an 
account of the known reproductive biology of 
