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| Mafuca, J.. |
| The reproductive biology of the Kapenta (Limnothrissa miodon), that supports the main commercial fishery in Lake Cahora Bassa (Mozambique) was investigated using monthly samples collected during 2003 and2004. This species was initially introduced in Lake Kariba in 1967/68 with the objective of filling up the pelagic environment that was created with dam closure. The fish is believed to have been able to negotiate the Kariba dam wall and became established in Cahora Bassa, some 250 km downstream, as well. The reproductive biology of Kapenta is known from Lake Tanganyika, where it is indigenous, and from Kariba,but no research has been performed, so far, in Cahora Bassa. Since many important biological attributes may vary from place to place, depending on... |
| Tipo: Journal Contribution |
Palavras-chave: Seasonality; Reproduction (biology); Sardine fisheries. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/5140 |
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| Van der Lingen, C.D.; Kreiner, A.; Fréon, P.. |
| Time-series of condition factor (CF) and gonadosomatic index (GSI) were generated using general linear models (GLM) for sardine Sardinops sagax stocks in the northern and southern Benguela ecosystems over the period 1984–1999. During this period the biomass of sardine in the northern Benguela remained at relatively low levels of <500 000 tons, whereas that of southern Benguela sardine increased 40-fold to 1.3 million tons. The GLMs explained 27 and 45% of the observed variation in CF, and 32 and 28% of the observed variation in GSI, for sardine in the northern and southern Benguela subsystems respectively. Whereas the sardine CF in the northern Benguela remained stable over time, that for the southern Benguela stock declined steadily during the study... |
| Tipo: Journal Contribution |
Palavras-chave: Abstracts; Ecosystems; Sardine fisheries; Ecosystems; Http://aims.fao.org/aos/agrovoc/c_2482. |
| Ano: 2001 |
URL: http://hdl.handle.net/1834/2124 |
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| L’analyse des résultats de la pêche artisanale, des sites sous revus, au premier semestre 2012, révèle une hausse globale de 13% des débarquements et de 15% de la valeur commerciale estimée (VCE) par rapport à la même période de 2011. Le sous secteur de la pêche industrielle, à l’exception de la pêche sardinière qui n’a pas fait l’objet de d’analyse dans cette note par faute de données disponibles, se caractérise par une baisse des débarquements de la pêche chalutière de 33% et une production de 1403,71 tonnes de la thonière au premier semestre 2012 comparativement à la même période de 2011 qui n’avait pas enregistré de débarquements. La transformation artisanale au niveau du site de Joal est marquée par une faible baisse de 4% de la production. Cette... |
| Tipo: Report |
Palavras-chave: Artisanal fishing; Fishing industry; Fish species; Landing statistics; Processing fishery products; Markets; Tuna fisheries; Trawling; Sardine fisheries; Exports; Trade. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/4723 |
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| Cousseau, M.B.; Gru, D.L.. |
| Samples of Sardina fueguina (Sprattus fuegensis)were taken during research cruises carried out in 1974 and 1978. Length and age frequency distributions were analyzed, and von Bertalanffy growth parameters were calculated for the coastal waters of two geographical regions: Province of Santa Cruz and northern part of Malvinas Islands. Lenght and weight growth curves have been calculated for each region and each year. Marked differences have been found between gowth parameters of both regions, and the calculated values showed a good fit with the observed ones. According to these results, it is possible to assume that the sardines of both regions constitute two different populations. However, more information on the total distribution of the species will have... |
| Tipo: Journal Contribution |
Palavras-chave: Age composition; Growth curves; Stock identification; Sardine fisheries; Age composition; Http://aims.fao.org/aos/agrovoc/c_29093. |
| Ano: 1982 |
URL: http://hdl.handle.net/1834/2052 |
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| Kirchner, C. H.; Bartholomae, C. H.; Kreiner, A.. |
| This study attempts to explain the variability in recruitment of sardine in the northern Benguela and to develop potential models by including environmental information to predict recruitment. Two different recruitment and spawner number datasets were available: a VPA-developed dataset, for the period 1952–1987, and data from a simple age-structured model for 1992–2007. In all, four environmental indices were used: the degree of the intrusion of the warm Angola Current into northern Namibia, termed the Angola–Benguela front index; the extent of the upwelling area off central Namibia; average sea surface temperature (SST) over the northern and central Namibian shelf; and wind stress anomalies at Lüderitz as an indicator of upwelling strength. Contrary to... |
| Tipo: Journal Contribution |
Palavras-chave: Currents (water); Upwelling; Sardine fisheries; Environments; Ecosystems; Anomalies; Biomass; Spawning; Recruitment. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4671 |
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