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 asynchronous oocyte development, and spawn multiple batches of oocytes each spawning season.
“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
In “Structure de la gonade” (page unavailable), the paper describes skipjack ovaries containing oocytes at different developmental stages. In “Fréquence de ponte des individus” (page unavailable), it infers repeated egg releases during a spawning period, but presents that inference cautiously. The findings concern western Indian Ocean skipjack, not tropical tunas generally, and the paper does not explicitly classify them as oviparous. (LLM, conf=0.86)
Experimental — accuracy not yet measuredReported individual fecundity for skipjack tuna in the western Indian Ocean ranges from 80,000 oocytes for a 44 cm FL female to 1.25 million oocytes for a 75 cm FL female.
“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
The sections on fecundity versus fork length and fishing area (page unavailable) report fecundity measurements for western Indian Ocean skipjack, including females as small as 44 cm. However, the passages do not establish the claimed endpoints of 80,000 oocytes at 44 cm and 1.25 million at 75 cm; searches for those numbers and sizes did not locate them in our copy. (LLM, conf=0.78)
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Cited by
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- 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
- Physical Sciences › Environmental Science › Global and Planetary Change › 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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