Article (Scientific journals)
How to efficiently determine the size at maturity of small-sized tropical fishes: A case study based on 144 species identified via DNA barcoding from southwestern Madagascar
Raharinaivo, Lovasoa Rina; Jaonalison, Henitsoa; Mahafina, Jamal et al.
2020In Journal of Applied Ichthyology, 36 (4), p. 402 - 413
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Keywords :
fish juveniles; mosquito seine net; small-scale fishery; tropical seagrass
Abstract :
[en] In order to provide biological evidence of the real impact of mosquito seine nets in southwestern Madagascar, an efficient procedure for determining the size at maturity of small-sized tropical fishes was developed. The fishes caught by two small-scale fishermen were studied between October 2017 and April 2018. One catch per day was analyzed three days per month during the full-moon period. In the laboratory, fishes were all sorted by morphospecies, photographed and measured. One individual per morphospecies was selected for being identified using CO1 DNA barcoding. A total of 34,051 individual fishes belonging to 144 DNA bacoded species from 48 families was obtained from 42 samples, 467 individuals from 22 morphospecies that had not been successfully barcoded were excluded from the analyses. The macroscopic observations of 8,143 individuals between 0.7 and 10 cm SL indicated the proportion of individuals with clearly observable gonads was 15% only.Among the 144 species identified via DNA barcoding, 83 consisted of individuals that were all without clearly observable gonads, seven of individuals that were all with clearly observable gonads and 54 included of individuals with and without clearly observable gonads. As the determination of L50 using logistic general linear models failed for most species, the minimum size at maturity was retained to determine the proportion of juveniles and adults for these 54 species. Compared to the data available in FishBase, the minimum size at maturity appears more adequate to discrimine juvenile from adult fish of small-sized tropical species.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Raharinaivo, Lovasoa Rina ;  Institut Halieutique et des Sciences Marines (IH.SM), Université de Toliara, Toliara, Madagascar
Jaonalison, Henitsoa  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Ecologie évolutive ; Institut Halieutique et des Sciences Marines (IH.SM), Université de Toliara, Toliara, Madagascar
Mahafina, Jamal;  Institut Halieutique et des Sciences Marines (IH.SM), Université de Toliara, Toliara, Madagascar
Ponton, Dominique;  ENTROPIE, IRD-Université de La Réunion-CNRS, Laboratoire d’Excellence CORAIL, c/o Institut Halieutique et des Sciences Marines, Université de Toliara, Toliara, Madagascar
Language :
English
Title :
How to efficiently determine the size at maturity of small-sized tropical fishes: A case study based on 144 species identified via DNA barcoding from southwestern Madagascar
Publication date :
August 2020
Journal title :
Journal of Applied Ichthyology
ISSN :
0175-8659
eISSN :
1439-0426
Publisher :
Blackwell Publishing Ltd
Volume :
36
Issue :
4
Pages :
402 - 413
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
The research was financially supported by IH.SM Jeune Equipe Associée à l'IRD “ACOM”, the Critical Ecosystem Partnership Fund (MG‐66341) and the Rufford Foundation (2ac29a‐1). Lovasoa Rina RAHARINAIVO benefited of Labex Corail financial support for field and laboratory work in Madagascar, and a MARG II WIOMSA grant (Contract 3/2018) for analyzing her data in France. Our gratitude is expressed to Dr. Lantoasinoro RANIVOARIVELO, Mrs. Claude‐Anne GAUTHIER, Dr. Mehdi ADJEROUD, Dr. Marc LÉOPOLD and Mrs. Hary‐Liva RAVELONJATOVO for their help at different stages of this study. Duphrehino, Jean Jacques, Mohamed, Thierry and Eric provided fieldwork assistance. We thank Beze and Pierrot, the two fishermen from Ankilibe village, without whom this study would have been impossible. We also thank two anonymous reviewers and Dr. Christian Wolter for their constructive comments on a previous version of this work. This is a publication from Laboratoire Mixte International “MIKAROKA”.
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