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Table 3 Fish measurements of mackerel tuna, Euthynnus affinis, used to determine sexual developmental stage and length to weight formula, obtained from fish caught on fishing trips

From: Small-scale capture, transport and tank adaptation of live, medium-sized Scombrids using “Tuna Tubes”

Fish

Lengtha (cm)

Body weight (kg)

Gonad weight (g)

Remarksb

GSIc (%)

1

54

2.6

4.26

M—immature testes

0.1638

2

64

4.0

51.36

F—maturing ovaries

1.284

3

66.5

4.85

34.12

M—dark gonads

0.7035

4

70

5.3

55.18

M—maturing testes

1.0411

5

68

5.05

41.14

M—maturing testes

0.8147

6

NA

0.78

0.42

Immature gonads

0.0538

7

NA

0.68

0.357

Immature gonads

0.0525

  1. aLength was measured as total length (TL)
  2. bM and F denotes male or female fish, respectively
  3. cGonadosomatic index (GSI), presented as percentage, was calculated as the ratio between gonad weight to total body weight (in grams)
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