Reproductive traits of deep-sea armoured shrimp, Glyphocrangon investigatoris from bay of Bengal, Indian ocean
Reproductive traits of deep-sea armoured shrimp, Glyphocrangon investigatoris from bay of Bengal, Indian ocean
Date
2019
Authors
Benjamin, D.
Harikrishnan, M.
Rozario, J.
Jose, D.
Kurup, B.
Sreedhar, U.
Cubelio, S.
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Abstract
Details on size at first maturity, embryo number and size, brood chamber volume and reproductive output of deep-sea
armoured shrimp, Glyphocrangon investigatoris caught off the south-east coast of India by using EXPO trawl from
633 m depth in FORV ‘Sagar Sampada’ are reported here. Eighty-four female shrimps ranging from 17.29–36.31 mm carapace
length and 2.28–16.54 g weight formed 7.73% of total catch, 30% of which was constituted by embryo-bearing females.
Regression of weight on carapace length revealed negatively allometric growth (r2 ¼ 0.85, P , 0.01). The size at first maturity
was estimated as 19.96 mm. The embryo number ranged from 55 to 233 with a mean of 120.24 +34 embryos and showed a
positive correlation to body size. Embryo diameter varied between 1.0 to 3.34 mm and more than 50% of embryos constituted
the 2.0–2.5 mm size class. Brood chamber volume and percentage frequency of embryo stage development revealed a linear
relationship with carapace length. Based on dry weight, mean reproductive output was estimated to be 0.16. The female
armoured shrimps showed a high reproductive investment evidenced from few, large, yolky embryos, indicating their
deep-sea adaptation.
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Citation
J. MAr. Biol. Assoc. UK 99(1):93-100