@article {4203, title = {Growth, survival and the histology of the digestive tract of juvenile Osteoglossum bicirrhosum (Cuvier, 1829) fed three diets containing different protein and lipid levels}, journal = {Journal of Applied Ichthyology}, volume = {31}, year = {2015}, pages = {67{\textendash}73}, abstract = {

The influence of three commercial diets with different protein and lipid contents (40\ :\ 14, 45\ :\ 8, 48\ :\ 8 protein\ :\ lipid {\textendash} P\ :\ L, in \% dry weight of diet) on growth performance, survival and the histology of the liver and intestine was analysed in early juveniles of silver arowana, Osteoglossum\ bicirrhosum, reared in captivity. Individuals (initial wet\ weight{\textendash}Wi\ =\ 1.07\ {\textpm}\ 0.04\ g; total length{\textendash}TL\ = 6.0\ {\textpm} 0.17\ cm) were raised in triplicate (n\ =\ 12 fish per tank) at 26.2\ {\textpm}\ 0.1{\textdegree}C and fed one of three commercial diets over 60\ days. At the end of the trial, survival (90.5\ {\textpm}\ 3.3\%) and condition factor (0.5\ {\textpm}\ 0.02) were not affected by dietary treatments, whereas specific growth rate, TL and W gain were lower in animals fed the 40P\ :\ 14L diet. Histological analysis revealed a larger accumulation of lipid droplets in the intestines of the group supplied with the 40P\ :\ 14L diet, as well as a larger surface of hepatic lipid vacuoles compared to the other treatments, although no signs of steatosis were observed. Juveniles fed the 48P\ :\ 8L diet displayed the lowest liver lipid accumulation; however, a protein content higher than 45\% did not improve growth performance. The intestine and liver lipid accumulation of individuals fed the 45P\ :\ 8L diet might indicate a more balanced lipidic metabolism. Intestine and liver histologies proved to be useful markers to identify the nutritional condition in juveniles of O.\ bicirrhosum, even when differences in nutritional composition were subtle (i.e. protein variation of 3\%).

}, issn = {1439-0426}, doi = {10.1111/jai.12977}, url = {http://dx.doi.org/10.1111/jai.12977}, author = {Darias, Maria and G{\'o}mez, M. A. and Salvador Tello and Gisbert, E} } @article {4398, title = {Movement patterns and home range of wild and re-stocked Arapaima gigas (Schinz, 1822) monitored by radio-telemetry in Lake Imiria, Peru}, journal = {Journal of Applied Ichthyology}, volume = {31}, year = {2015}, pages = {10{\textendash}18}, issn = {1439-0426}, doi = {10.1111/jai.12972}, url = {http://dx.doi.org/10.1111/jai.12972}, author = {Jesus Nu{\~n}ez-Rodriguez and Fabrice Duponchelle and Cotrina-Doria, M. and Renno, Jean-Francois and Ch{\'a}vez Veintemilla, C and Rebaza, C. and Deza, S. and Garc{\'\i}a-D{\'a}vila, C and Chu-Koo, F and Salvador Tello and Baras, Etienne} } @article {4397, title = {Periodic life history strategy of Psectrogaster rutiloides, Kner 1858, in the Iquitos~region, Peruvian Amazon}, journal = {Journal of Applied Ichthyology}, volume = {31}, year = {2015}, pages = {31{\textendash}39}, issn = {1439-0426}, doi = {10.1111/jai.12974}, url = {http://dx.doi.org/10.1111/jai.12974}, author = {Garc{\'\i}a-Vasquez, Aurea and Vargas, Gladys and S{\'a}nchez, H and Salvador Tello and Fabrice Duponchelle} } @article {4392, title = {Variations in reproductive strategy of the silver Arowana, Osteoglossum bicirrhosum Cuvier, 1829 from four sub-basins of the Peruvian Amazon}, journal = {Journal of Applied Ichthyology }, volume = {31}, year = {2015}, pages = {19-30}, author = {Fabrice Duponchelle and Ruiz-Arce Adela and Waty, A. and Garc{\'\i}a-Vasquez, Aurea and Renno, J-F and Chu-Koo, F and Garc{\'\i}a-D{\'a}vila, C. and Vargas, Gladys and Salvador Tello and Ortiz, A. and Pinedo, R. and Manzanares V{\'a}squez, R. and Jesus Nu{\~n}ez-Rodriguez} } @article {3250, title = {Histological development of the digestive system of the Amazonian pimelodid catfish Pseudoplatystoma punctifer.}, journal = {Animal}, volume = {8}, year = {2014}, month = {2014 Nov}, pages = {1765-76}, abstract = {

The organogenesis of the digestive system was described in the Amazonian pimelodid catfish species Pseudoplatystoma punctifer from hatching (3.5 mm total length, TL) to 41 days post-fertilization (dpf) (58.1 mm TL) reared at 28{\textdegree}C. Newly hatched larvae showed a simple digestive tract, which appeared as a straight undifferentiated and unfolded tube lined by a single layer of columnar epithelial cells (future enterocytes). During the endogenous feeding period, comprised between 20 and 96 h post-fertilization (3.5 to 6.1 mm TL), the larval digestive system experienced a fast transformation with the almost complete development and differentiation of most of digestive organs (buccopahrynx, oesophagus, intestine, liver and exocrine pancreas). Yolk reserves were not completely depleted at the onset of exogenous feeding (4 dpf, 6.1 mm TL), and a period of mixed nutrition was observed up to 6 to 7 dpf (6.8 to 7.3 mm TL) when yolk was definitively exhausted. The stomach was the organ that latest achieved its complete differentiation, characterized by the development of abundant gastric glands in the fundic stomach between 10 and 15 dpf (10.9 to 15.8 mm TL) and the formation of the pyloric sphincter at the junction of the pyloric stomach and the anterior intestine at 15 dpf (15.8 mm TL). The above-mentioned morphological and histological features observed suggested the achievement of a digestive system characteristic of P. punctifer juveniles and adults. The ontogeny of the digestive system in P. punctifer followed the same general pattern as in most Siluriform species so far, although some species-specific differences in the timing of differentiation of several digestive structures were noted, which might be related to different reproductive guilds, egg and larval size or even different larval rearing practices. According to present findings on the histological development of the digestive system in P. punctifer, some recommendations regarding the rearing practices of this species are also provided in order to improve the actual larval rearing techniques of this fast-growing Neotropical catfish species.

}, issn = {1751-732X}, doi = {10.1017/S1751731114001797}, author = {Gisbert, E and Moreira, C and Castro-Ruiz, D and Ozt{\"u}rk, S and Fern{\'a}ndez, C and Gilles, S and Jesus Nu{\~n}ez-Rodriguez and Fabrice Duponchelle and Salvador Tello and Renno, J F and Garc{\'\i}a-D{\'a}vila, C and Darias, Maria} }