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Comparison of indices for the assessment of reproductive activity in Hexaplex trunculus (Gastropoda: Muricidae) Vasconcelos, P.; Lopes, B.; Castro, M.; Gaspar, M.B. (2008). Comparison of indices for the assessment of reproductive activity in Hexaplex trunculus (Gastropoda: Muricidae). Mar. Biol. Res. 4(5): 392-399. http://dx.doi.org/10.1080/17451000802020436 In: Marine Biology Research. Taylor & Francis: Oslo; Basingstoke. ISSN 1745-1000; e-ISSN 1745-1019

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Beschikbaar in	Auteurs
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Trefwoorden

Analysis > Quantitative analysis ANE, Portugal, Ria de Formosa Biology > Histology Comparative studies Evaluation > Performance assessment Maturation Quantitative analysis Quantitative analysis Reproductive cycle Sampling Secretory organs > Glands > Endocrine glands > Animal reproductive organs > Gonads Spawning Temporal variations > Periodic variations > Seasonal variations Gastropoda [WoRMS]; Hexaplex trunculus (Linnaeus, 1758) [WoRMS]; Muricidae Rafinesque, 1815 [WoRMS] Algarve [Marine Regions]; Ria Formosa Lagoon [Marine Regions] Marien/Kust

Author keywords

capsule gland; gonads; Hexaplex trunculus; reproductive activity index

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Auteurs		Top
Vasconcelos, P. Lopes, B. Castro, M. Gaspar, M.B.

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Abstract

The present study compares the ability of conventional condition indices (based on weight of the whole organism, weight of its flesh, and/or its shell weight) and visual quantitative indices (based on measures of the digestive gland, gonad, and capsule gland on digitized images of sections of these organs) for the assessment of reproductive activity in Hexaplex trunculus. To estimate conventional indices, a total of 120 standard-sized specimens (50 males and 70 females) in the 60-70 mm shell length interval were analysed. To estimate visual quantitative indices, a total of 903 specimens (501 males and 402 females) were analysed for the gonadosomatic index (GSI); females were also analysed for the capsule gland index (CGI). Compared to conventional indices, the visual quantitative indices (GSI and CGI) followed seasonal variations of the species reproductive cycle and identified broad changes in reproductive development (being highly accurate in detecting the main period of gonad maturation and spawning that occurred between May and June). Results indicate that both GSI and CGI constitute simple, practical and efficient indices for the routine assessment of reproductive activity in H. trunculus, providing a useful and reliable alternative to conventional condition indices and to histological analyses. Results of this study encourage the use of similar sampling procedures and analytical techniques, and analogous visual quantitative indices, to assess reproductive activity in other gastropod species.

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