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La fécondité du listao(Katsuwonuspelamis)de l'ouest de l'océan Indien
Open accessAbstract
La fécondité par acte de ponte du listao Katsuwonus pelamis de l'ouest de l'océan Indien a été étudiée à partir de 281 femelles dont les tailles (longueur à la fourche) sont comprises entre 43 et 73 cm et dont les ovaires étaient à un stade de maturité sexuelle avancé. Le liquide de Gilson, utilisé comme agent conservateur et dissociateur des ovocytes, a une action importante et rapide (5 jours) sur le rétrécissement des ovocytes. Des comptages effectués à l'aide d'une cuve de Dollfus sur des sous-échantillons d'ovocytes dissociés, montrent que pour une même période d'activité sexuelle (février), la fécondité du listao du canal de Mozambique est semblable à celle des listaos du sud du plateau des Seychelles. Bien qu'une activité sexuelle du listao soit notée tout au long de l'année, la fécondité individuelle varie d'une saison à l'autre et ce, pour un même secteur géographique. Cette fécondité individuelle par acte de ponte varie de 80 000 œufs pour des femelles de 44 cm provenant de la côte nord-ouest de Madagascar à 1,25 millions d'œufs pour des femelles de 75 cm pêchées autour des Seychelles. La fécondité relative correspondante évolue donc entre 40 et 130 œufs/g de poids de corps. Pour cette espèce, le nombre de pontes successives a été estimé à 4 par an.
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“Tropical tunas are oviparous, have an asynchronous oocyte development and spawn multiple batches of oocytes each spawning season (Joseph, 1963; Hunter et al., 1986; Stéquert and Ramcharrun, 1995; Schaefer, 2001).”
From A review of the fisheries, life history and stock structure of tropical tuna (skipjack Katsuwonus pelamis, yellowfin Thunnus albacares and bigeye Thunnus obesus) in the Indian Ocean (2021) · cites this paper as Stéquert and Ramcharrun, 1995
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“Reported individual fecundity for skipjack tuna range from 80,000 oocytes for a 44 cm FL female to 1.25 million oocytes for a large (75 cm FL) female in the western Indian Ocean (Stéquert and Ramcharrun, 1995).”
From A review of the fisheries, life history and stock structure of tropical tuna (skipjack Katsuwonus pelamis, yellowfin Thunnus albacares and bigeye Thunnus obesus) in the Indian Ocean (2021) · cites this paper as Stéquert and Ramcharrun, 1995
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Metadata
- Authors
- Stéquert, B., & Ramcharrun, B.
- Venue
- Aquatic Living Resources
- Publisher
- EDP Sciences
- Published
- 1995-01
- Volume
- 8
- Issue
- 1
- Pages
- 79-89
- ISSN
- 0990-7440 (ISSN-L)
- OpenAlex
- W2033177968
- Cited by
- 20
- References
- 0
- Citations by year
- 2022: 1 · 2020: 1 · 2019: 1 · 2018: 1 · 2016: 3 · 2015: 2 · 2014: 2 · 2013: 2 · 2012: 2
- FWCI
- 0.00
- Type
- journal article
- Language
- fr
- Open access
- bronze
- doi.org
- Locations
- Aquatic Living Resources (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Marine and fisheries research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Reproductive biology and impacts on aquatic species
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
- Keywords
- skipjack tuna, fecundity, spawning frequency, seasonal variation, relative fecundity, Western Indian Ocean, Mozambique Channel, Seychelles, Madagascar
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