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| Registros recuperados: 10 | |
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| Romagny, B; Menard, Frederic; Dewals, P; Gaertner, Daniel; N'Goran, N. |
| Abidjan is the biggest fishing harbour of tropical tunas in the Gulf of Guinea (around 100 000 mt per year). Three canneries work on four species (yellowfin, skipjack, bigeye and albacore). Small size tuna, minor tuna and by-catches are refused by the canneries and are sold on the local market fish. It is the only part of the industrial purse seine catches directly sold in Abidjan. Since 1990, fishing operations on schools of tuna associated with artificial drifting FADs has become widespread. Log fishery allow to catch a majority of small tunas, and generates by-catches of various other pelagic species associated to the logs. The landed amounts of local market fish have increased: from 8 500 Mt per year estimated between 1987 and 1990, 21 000 Mt is... |
| Tipo: Text |
Palavras-chave: Attracting techniques Capture fishery economics Marketing Tuna fisheries Article Geographic Terms: ASE; Atlantic; Guinea Gulf. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00042/15318/12642.pdf |
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| Simon, Maximilien; Fromentin, Jean-marc; Bonhommeau, Sylvain; Gaertner, Daniel; Brodziak, Jon; Etienne, Marie-pierre. |
| The intrinsic population growth rate (r) of the surplus production function used in the biomass dynamic model and the steepness (h) of the stock-recruitment relationship used in age-structured population dynamics models are two key parameters in fish stock assessment. There is generally insufficient information in the data to estimate these parameters that thus have to be constrained. We developed methods to directly estimate the probability distributions of r and h for the Atlantic bluefin tuna (Thunnus thynnus, Scombridae), using all available biological and ecological information. We examined the existing literature to define appropriate probability distributions of key life history parameters associated with intrinsic growth rate and steepness, paying... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00115/22640/20362.pdf |
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| Kaplan, David; Bach, Pascal; Bonhommeau, Sylvain; Chassot, Emmanuel; Chavance, Pierre; Dagorn, Laurent; Davies, Tim; Dueri, Sibylle; Fletcher, Rick; Fonteneau, Alain; Fromentin, Jean-marc; Gaertner, Daniel; Hampton, John; Hilborn, Ray; Hobday, Alistair; Kearney, Robert; Kleiber, Pierre; Lehodey, Patrick; Marsac, Francis; Maury, Olivier; Mees, Chris; Menard, Frederic; Pearce, John; Sibert, John. |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00139/25068/23186.pdf |
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| Baidai, Y; Dagorn, Laurent; Amande, Mj; Gaertner, Daniel; Capello, Manuela. |
| The aggregative behavior of tuna around floating object is widely exploited by the industrial purse-seine fishery, which deploy thousands of floating objects each year in all oceans in order to improve their catches. These fish aggregating devices (FADs) are generally equipped with echosounder buoys that can collect acoustic data, conferring to these devices the status of privileged observation platforms for the fish communities that aggregate. Using a classification model based on supervised learning algorithms trained on M3I buoy data, we were able to translate the acoustic data collected along the trajectories of 5748 drifting FADs newly deployed between 2016 and 2018 in the Indian Ocean into presence or absence of tuna aggregation. Analysis of the... |
| Tipo: Text |
Palavras-chave: Echosounders; Drifting fish aggregating devices (FAD); Tropical tunas; Behaviour. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00615/72694/71700.pdf |
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| Baidai, Yannick; Dagorn, Laurent; Gaertner, Daniel; Denebourg, Jean-louis; Duparc, Antoine; Floch, Laurent; Capello, Manuela. |
| This paper presents an associative behavior-based abundance index (ABBI) providing direct estimates of the abundance of yellowfin tuna (Thunnus albacares) based on their associative behavior around floating objects (FOBs). Considering the associative dynamics of small yellowfin tuna individuals (<10 kg) at FOBs through residence and absence times at FOBs, together with acoustic data obtained from fisher’s echosounder buoys, the ABBI index is derived for yellowfin tuna in the western Indian Ocean over the period 2013-2019. This index accounts for both the FOB-associated and free-swimming components of the tuna populations, as well as for the effects of increasing numbers of FOBs on each component. |
| Tipo: Text |
Palavras-chave: Abundance Index; Associative behavior; FADs; Yellowfin tuna. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00693/80507/83718.pdf |
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| Gaertner, Daniel. |
| A multiplication model, fitted by weighted least squares, is used to determine factors affecting monthly c.p.u.e. of monk (anglerfish). These include annual indices of abundance, from which concentration indices may be calculated; seasonal factors at different depths; and relative fishing power. A steep increase in the total annual index of abundance may be partially explained by the simultaneous increase of the smallest fishes index. The increased concentration index of this commercial category is probably due to a decrease of discards; as suggested by severa! authors, however, climatic changes may also account for increased biomass of the species considered. |
| Tipo: Text |
Palavras-chave: Lophiidae; C.p.u.e.; Désaisonnalisation; Plateau celtique; Lophiidae; C.p.u.e.; De-seasonalizing; Celtic plateau. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/00113/22456/20143.pdf |
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| Registros recuperados: 10 | |
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