16 research outputs found
Effect of Dietary Protein and Metabolizable Energy Levels on Growth and Feed Utilization of Sea Bass (Decentrarshus laborax) Larvae
ABSTRACT Three dietary protein levels (25, 35 and 45%) and two dietary metabolizable energy levels (250 and 300 kcal/100g diet) at a 3×2 factorial experiment were combined to study their effects on growth performance, body composition and feed utilization of sea bass (Decentrarshus laborax) larvae. The larvae had initial body weight of 0.8 g. In glass aquaria this experiment lasted for five weeks. Fish were fed 3 times daily to satiation 7 days per week with changing water daily by freshly stocked brackish water (15ppt) and continuous aeration. Fish were weighed every two weeks. Weight gain of sea bass increased significantly with increasing dietary crude protein level up to 45% and decreased significant with increasing energy levels from 250 and 300 kcal/100 g diets. Feed conversion ratio (FCR) improved with increasing dietary crude protein level up to 45% and no differences were found between 250 and 300 kcal/100g diets. Protein and lipid content of sea bass larvae increased significantly with increasing dietary crude protein level from 25% to 45%. Also, lipid content of sea bass larvae increased with increasing dietary energy level from 250 to 300 kcal/100 g diets, but, protein content decreased. The best SGR was observed with 45% dietary crude protein with 250 kcal/100g diet. Final body weight (FBW) of sea bass increased significantly (P<0.05) with increasing dietary crude protein level up to 45% with 250 kcal/100 g diets. ER% increased significantly (P<0.05) with increasing dietary crude protein level, but it decreased with increasing energy level. This result indicates that the best protein and energy levels for sea bass larvae (0.8 g BW) growth are 45% and 250 kcal, respectively. Lower protein level has given better protein utilization and a protein sparing effect but tended to result in reduced weight gain and feed intake, when compared with diet containing higher protein level at 45%
Dynamics of Macroalgae at Two Different Ecological Sites in Alexandria Coastal Waters
A year cycle investigation of the macroalgae dynamics in Alexandria coastal waters was conducted at two selected stations that maximize possible differences in seawater characteristics. Eleven genera, including seventeen species were identified at the Eastern Harbour (EH) and Abou Talat (AT). The total species richness was higher at EH, but the algal species composition was highly similar at the two sites. The floristic ratio at EH indicates a mixed flora of warm temperate nature. The prevalence of red and brown algae was detected at relatively high salinities, and green opportunistic algae at lower salinities, and with nutrient pulses indicate its importance as ecological factors regulate the structure of the macroalgae communities in Alexandria waters. The changes in algal proportion reflected the anthropogenic influence and/or improvement in environmental quality at times. Incidents of massive green macroalgae proliferation occurred at a wide range of environmental variations, and with the sharing of other red species. Ulva fasciata represented a perennial species and the spring warming and nutrient enrichment seem to interact with its massive growth. The study is yet the first attempt to measure the algal biomass of different species under different physical and chemical ecological stresses
Phytoplankton evolution during the creation of a biofloc system for shrimp culture
[EN] Microalgae play a key role in the dynamics of biofloc technology aquaculture systems. Some phytoplankton groups, such as diatoms, are desired for their high nutritional value and contribution to water quality. Other groups, such as cyanobacteria, are undesired because of their low nutritional value and capacity of producing toxins. So, monitoring the phytoplankton community structure and succession is key for managing biofloc systems. However, research on phytoplankton in these systems is scarce and mostly done by microscopy. The primary objective of this research was to estimate phytoplankton community structure in shrimp biofloc system water samples, using high-performance liquid chromatography methods and CHEMTAX software. The major groups present in our system were diatoms, euglenophytes, cyanobacteria and chlorophytes, while dinoflagellates were only remarkable at the initial period. We observed a clear dominance of diatoms all along the 5 months that comprised a complete biofloc system culture. The characteristic succession of autotrophic processes by heterotrophs of the biofloc systems, was observed by the reduction of net primary production. Light intensity played a key role in determining the phytoplankton composition and abundance. Algal pigment analyses using high-performance liquid chromatography and subsequent CHEMTAX analysis in water samples was useful for estimating the phytoplankton community structure in the biofloc systems. However, we found some limitations when the biofloc system was in heterotrophic mode. Under these conditions, some dinoflagellates and cyanobacteria behaved as heterotrophs and lost or decreased their biomarkers pigments. So, further research is needed to increase knowledge on the accuracy of high-performance liquid chromatography /CHEMTAX under these conditions.Financial support for this research was provided by Conselleria d’Educació, Investigació, Cultura i Esport of the Generalitat Valenciana, through the program VALi+D, fle number ACIF/2014/244. We would like to express our deepest thanks to Professor Luis Henrique da Silva Poersch of FURG (Universidade Federal do Rio Grande) and Ivan Vidal (Langostinos el Real) for his support. Finally, the authors wish to thank Le Gouessant and Michaël Metz for providing the commercial feed.Llario-Sempere, F.; Rodilla, M.; Escrivá-Perales, J.; Falco, S.; Sebastiá-Frasquet, M. (2018). Phytoplankton evolution during the creation of a biofloc system for shrimp culture. 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Lipídeos na Alimentação de Alevinos Revertidos de Tilápia do Nilo (Oreochromis niloticus, L.)
Composition of Trace Mineral Inclusions in Cassiterite of Greisens and Greisenized Rocks at Homr Akarem Area Eastern Desert, Egypt
Effect of Fertilization on Production of Nile Tilapia in Earthen Ponds II) Effect of an untraditional organic fertilizer and stocking density on the fish yield of Mixed-sex Nile tilapia ( Oreochromis niloticus)
ABSTRACT The experiment was designed to determine the optimal fertilizing rate of Abis organic fertilizer and to investigate the effect of stocking density on mixed-sex Nile tilapia performance. . Fish in this experiment were fed to apparent satiation level in 20 min. This experiment lasted for 112 days. Water quality parameters were monitored weekly in each experiment. Growth rate, specific growth rate, gross yield did not significantly differ among treatments, due to variation between replicates within treatments. Gross yield showed a positive trend with both the fertilizing rate and stocking density. The effect of the treatments on water quality parameters was discussed