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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)