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Table 1 Monthly distribution of the different maturity stages and sex ratio for males, females and hermaphrodite (H) of Paphia undulata from January to December 2020

From: The gametogenic cycle and spawning of the short-necked clam, Paphia undulata Born, 1778 (Bivalvia: Veneridae) from Timsah Lake, Suez Canal, Egypt

Months

Male

Total No

Female

Total No

H

Sex ratio

M:F:H

EAS

LAC

RS

PSS

SS

EAS

LAC

RS

PSS

SS

Jan

6

3

7

  

16

3

7

3

  

13

1

1:0.81:0.08

Feb

1

3

2

  

6

1

1

3

  

5

1

1:0.83:0.20

Mar

 

3

5

4

 

12

1

8

6

5

 

20

 

1:1.67:0.00

Apr

 

4

6

3

 

13

 

4

9

1

1

15

 

1:1.15:0.00

May

 

5

5

3

2

15

 

4

5

3

2

14

 

1:0.93:0.00

Jun

 

3

5

 

1

9

 

1

3

2

1

7

1

1:0.78:0.14

Jul

 

2

3

2

1

8

 

2

5

1

1

9

1

1:1.13:0.11

Aug

 

1

6

 

1

8

 

5

4

1

2

12

2

1:1.50:0.17

Sep

 

3

5

5

1

14

 

2

3

5

1

11

 

1:0.79:0.00

Oct

  

2

8

2

12

 

5

6

2

 

13

 

1:1.08:0.00

Nov

  

3

2

 

5

 

4

2

  

6

 

1:1.20:0.00

Dec

2

8

4

3

 

17

9

8

1

1

 

19

 

1:1.12:0.00

Total No

9

35

53

30

8

135

14

51

50

21

8

144

6

1:1.07:0.04

  1. EAS early active stage, LAS late active stage, RS ripe (Maturing) stage, PSS partially spent (spawning) stage, SS spent stage, (H) hermaphrodite, M male, F female