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| Ivanovic, M.L.. |
| The information gathered during four research cruises carried out in January and February of 2006, 2007 and 2008 allowed to analyze the summer feeding pattern of Illex argentinus squid in the shelf and slope of the Patagonian region (43º S-51º S), SW Atlantic Ocean. Intake, that took place during daytime, had its peak as of midday. Of the preys eaten amphipods and euphausiids, two groups of zooplanktonic organisms, represented 71-99% of the diet. The most frequent preys found in three of the four cruises corresponded to amphipods, represented by a single species, the hyperiid Themisto gaudichaudii, that accounted for over 50% of the food consumed. When depth of the catching area was beyond 100 m an increase in consumption of squid and fish by specimens... |
| Tipo: Journal Contribution |
Palavras-chave: Feeding behaviour Predation Stomach content Fishery surveys Illex argentinus Atlántico Sudoccidental; Argentina marine environment. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4224 |
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| Gorini, F.L.; Abachian, V.E.; Giussi, A.R.. |
| Southern hake (Merluccius australis) age and growth were estimated using sagittae otoliths obtained in research cruises and observers programs in the Argentine Sea (SW Atlantic). The only annual growth ring observed, formed by two bands, one hyaline and another opaque, corresponded to winter and summer growth, respectively. According to the analysis of otoliths edge, birthday was established on 1st July. Within the age range observed, that comprised 3-18 year old specimens, age groups 7, 8 and 9 were the most frequently identified in both sexes. Growth parameters estimates showed significant differences between them. |
| Tipo: Journal Contribution |
Palavras-chave: Age determination Age groups Growth rings Otoliths Merluccius australis Atlántico Sudoccidental; Argentina marine environment. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4223 |
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| Giussi, A.R.; Sánchez, F.; Wohler, O.C.; Bernardele, J.C.. |
| Several grenadier species distribute in the SW Atlantic Ocean. Macrourus carinatus and Caelorinchus fasciatus are more frequently identified in commercial catches and during research cruises. Those benthopelagic fishes, related to subantarctic waters, inhabit at depths beyond 200 m and in high seas, between 36º S-59º S. During the surveys carried out on board of Argentinean research vessels, M. carinatus was present in 4% of the trawls performed. The highest densities (>17 t nm-2), obtained between 360-380 m depth, at 39º S, decreased significantly southwards. C. fasciatus was caught in 6% of the total trawls and the highest densities (15-35 t nm-2) were found at depths beyond 200 m, south of 52º S. Due to the difficulty encountered to identify them, in... |
| Tipo: Journal Contribution |
Palavras-chave: Commercial fishing bottom trawling demersal fisheries catch statistics Atlántico Sudoccidental; Argentina marine environment. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4220 |
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| Leonarduzzi, E.; Massa, A.E.; Manca, E.A.. |
| The biochemical composition and energy content of muscle, liver and gonads of Merluccius hubbsi females during the reproductive cycle were assessed. Adult females (44-50 cm total length) were caught in the Patagonian area (43~' S-45~' S). Condition factor (K) and hepatosomatic index (HSI) were estimated. Proteins and lipids in each tissue were determined. Besides, water and ashes content in muscle was analyzed. In all tissues the biochemical components underwent variations during the reproductive cycle. During the process gonads showed a significant drop in protein and lipid content (P < 0.01). In muscle, a decrease in proteins (P < 0.01) and lipids in the postspawning period was observed; the percentage of both components increased during the... |
| Tipo: Journal Contribution |
Palavras-chave: Chemical composition Reproductive cycle Proteins Lipids Merluccius hubbsi PSW; Argentina marine environment. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4908 |
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