scholarly journals Impacts of dietary cyanobacteria on fish

2010 ◽  
Vol 58 (4) ◽  
pp. 277-284 ◽  
Author(s):  
Andrea Ziková ◽  
Miroslava Palíková ◽  
Jan Mareš ◽  
Stanislav Navrátil ◽  
Radovan Kopp
Keyword(s):  
Abundant Species ◽  
Oral Route ◽  
Partial Replacement ◽  
Water Bloom ◽  
Fish Diet ◽  
Primary Producers ◽  
Commercial Fish ◽  
Fish Diets ◽  
Short Period ◽  
Nutrition Value

Development of cyanobacterial water bloom became a common issue all over the world. Cyanobacteria are the most important primary producers in aquatic ecosystems but in some abundant species their secondary metabolites called cyanotoxins seem to be harmful for many animal groups especially mammals but also fish. In fishes, adverse effects have been demonstrated in several studies applying cyanotoxins by unnatural injection. However, cyanobacteria and fish coevolved during ages and therefore the question arises whether cyanobacteria might be even used for fish via oral application (fish diet). The use of cyanobacteria for fish diets is varying including applications of pure cyanobacteria biomass as well as incorporation of cyanotoxin containing cyanobacteria biomass into commercial fish diet. The impacts of cyanobacteria in fish diets administered via the oral route revealed contradictory findings ranging from moderate negative to growth promoting impacts and it seems that any bioaccumulation of microcystins can become depurated by rearing fish in clean water for a short period. According to the results obtained from various experiments, cyanobacteria as primary producers might be used as a component of fish diets especially concerning partial replacement of fish meal. However, the determination of nutrition value and the bioavailibility of nutrients present in cyanobacteria for different fish species needs to be determined. Furthermore thorough research is needed to exclude any harmful problem for the final consumers – humans.

scholarly journals Partial replacement of artificial diets by wet bioflocs biomass in Nile tilapia culture tanks

2018 ◽  
Vol 40 (1) ◽  
pp. 42426
Author(s):  
Nayara Nunes Caldini ◽  
Hermano Hertz de Almeida Capistrano ◽  
Pedro Roberto Nogueira Rocha-Filho ◽  
Marcelo Vinícius do Carmo e Sá
Keyword(s):  
Nile Tilapia ◽  
Positive Control ◽  
Negative Control ◽  
Partial Replacement ◽  
Artificial Diets ◽  
Final Body Weight ◽  
Commercial Diet ◽  
Short Period ◽  
Water Ph ◽  
Dry Diet

The present work aimed to assess the partial replacement of artificial diets by wet bioflocs biomass in the culture of Nile tilapia juveniles. Fish were fed on different combinations of commercial dry diets (CD) and wet bioflocs biomass (BF), as it follows: 75% CD + 25% BF, 50% CD + 50% BF, and 25% CD + 75% BF, dry matter basis. There were also positive control tanks in which the fish received only commercial diet (100% CD), and three negative control tanks where the reductions of dry diets were not compensated by wet bioflocs biomass (75% CD, 50% CD, and 25% CD). Bioflocs were produced in one 500-L outdoor tank, which did not belong to the culture system, and it was called “separate BFT tank”, in which there was a daily adjustment of the C: N ratio of water to 15: 1, by the application of dry molasses to the water. There were no significant differences between the treatments for water pH, O2, TAN and NH3. Except by 25% CD, nitrite concentrations in water were lower in bioflocs tanks than in the artificial diet tanks. The final body weight of fish was significantly higher in tanks that received only dry diets (21.9 ± 6.4 g) than in tanks with a combination of 50% dry diet and 50% wet bioflocs biomass (10.4 ± 2.5 g; p < 0.05). It can be concluded that the impairment on the growth performance of tilapia submitted to feeding restriction is lessened if wet bioflocs biomass is provided to the animals. Besides, the total substitution of artificial diets for wet bioflocs biomass in clear-water tanks is unfeasible because it leads to higher rates of mortality of tilapia in a relatively short period. 

Bacterial Counts of Commercial Fish Diets

1971 ◽  
Vol 28 (8) ◽  
pp. 1185-1189 ◽  
Author(s):  
T. J. Trust
Keyword(s):  
Fluorescent Pseudomonads ◽  
Total Count ◽  
Aerobic Bacteria ◽  
Fish Production ◽  
Commercial Fish ◽  
Fish Diets ◽  
Thermophilic Species ◽  
Aerobic And Anaerobic ◽  
Spore Forming Bacteria ◽  
Representative Samples

Two diets formulated and offered for commercial fish production were examined to determine their microbial burden. The total count of aerobic bacteria ranged from 103 to 107 bacteria per gram of diet. The diets contained psychrophilic and thermophilic species and up to 104 aerobic and anaerobic spore-forming bacteria per gram. Enterococci and members of the Enterobacteriaceae, including species of Salmonella, were also present. Fluorescent pseudomonads were detected in 18 of the 47 samples tested, Proteolytic, amylolytic, lipolytic, and haemolytic organisms were shown to be present in measurable numbers. The total viable aerobic count did not change markedly on storage of representative samples at 4, 20, or 30 C.

scholarly journals Growth Performance and Adaptability of European Sea Bass (Dicentrarchus labrax) Gut Microbiota to Alternative Diets Free of Fish Products

2020 ◽  
Vol 8 (9) ◽  
pp. 1346 ◽  
Author(s):  
David Pérez-Pascual ◽  
Jordi Estellé ◽  
Gilbert Dutto ◽  
Charles Rodde ◽  
Jean-François Bernardet ◽  
...  
Keyword(s):  
Microbial Community ◽  
Gut Microbiota ◽  
Growth Performance ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Partial Replacement ◽  
European Sea Bass ◽  
Protein Sources ◽  
Fish Diets ◽  
Gut Microbial Community

Innovative fish diets made of terrestrial plants supplemented with sustainable protein sources free of fish-derived proteins could contribute to reducing the environmental impact of the farmed fish industry. However, such alternative diets may influence fish gut microbial community, health, and, ultimately, growth performance. Here, we developed five fish feed formulas composed of terrestrial plant-based nutrients, in which fish-derived proteins were substituted with sustainable protein sources, including insect larvae, cyanobacteria, yeast, or recycled processed poultry protein. We then analyzed the growth performance of European sea bass (Dicentrarchus labrax L.) and the evolution of gut microbiota of fish fed the five formulations. We showed that replacement of 15% protein of a vegetal formulation by insect or yeast proteins led to a significantly higher fish growth performance and feed intake when compared with the full vegetal formulation, with feed conversion ratio similar to a commercial diet. 16S rRNA gene sequencing monitoring of the sea bass gut microbial community showed a predominance of Proteobacteria, Firmicutes, Actinobacteria, and Bacteroidetes phyla. The partial replacement of protein source in fish diets was not associated with significant differences on gut microbial richness. Overall, our study highlights the adaptability of European sea bass gut microbiota composition to changes in fish diet and identifies promising alternative protein sources for sustainable aquafeeds with terrestrial vegetal complements.

Induction of vitellogenin production in male tilapia (Oreochromis mossambicus) by commercial fish diets

2009 ◽  
Vol 154 (2) ◽  
pp. 249-254 ◽  
Author(s):  
Lori K. Davis ◽  
Bradley K. Fox ◽  
Chhorn Lim ◽  
Naoshi Hiramatsu ◽  
Craig V. Sullivan ◽  
...  
Keyword(s):  
Oreochromis Mossambicus ◽  
Commercial Fish ◽  
Fish Diets

Distribution and abundance of some Hyperiidea (Crustacea : Amphipoda) in Northern Queensland Waters

1984 ◽  
Vol 35 (3) ◽  
pp. 285 ◽  
Author(s):  
W Zeidler
Keyword(s):  
High Salinity ◽  
Abundant Species ◽  
The Other ◽  
Barrier Reef ◽  
Short Period ◽  
Regular Sampling ◽  
Salinity Data ◽  
Oceanic Species ◽  
Quantitative Results ◽  
Inshore Waters

Hyperiid amphipods (35 species) were collected at eight regular sampling stations, spaced evenly between Townsville and the Great Barrier Reef, over 1 year (October 1972 to October 1973). The distribution and abundance of the Hyperiidea in northern Queensland, where hyperiids were generally most abundant during October-December and April-July, are discussed and quantitatively analysed and related to temperature and salinity data collected at the same time. The quantitative results indicate that hyperiids can be relatively abundant and may be a more important component of the inshore plankton than was thought previously. Only 13 species were sufficiently abundant to permit a more detailed discussion of their ecology. The two most abundant species, Lestrigonus bengalensis and Hyperioides sibaginis, were found most often in inshore waters and may form permanent local populations. Most of the other species were epipelagic oceanic species preferring warm waters (> 25�C) of relatively high salinity (>35 × 10-3) and were rarely found close inshore. Some species, Simorhynchotus antennarius, Tullbergella cuspidata and species of Phronimidae, only occurred in the plankton for a short period.

The source of bromophenols in some species of Australian ocean fish

1995 ◽  
Vol 31 (11) ◽  
pp. 113-120 ◽  
Author(s):  
F. B. Whitfield ◽  
F. Helidoniotis ◽  
D. Svoronos ◽  
K. J. Shaw ◽  
G. L. Ford
Keyword(s):  
Marine Algae ◽  
Eastern Coast ◽  
Gut Contents ◽  
Fish Diet ◽  
Benthic Organisms ◽  
Important Species ◽  
Relative Contribution ◽  
Fish Diets ◽  
Commercially Important ◽  
Total Concentrations

The carcass and gut contents of 10 species of fish caught along the eastern coast of Australia were analysed by gas chromatography-multiple ion detection-mass spectrometry for a range of bromophenols including 2- and 4-bromophenol, 2,4- and 2,6-dibromophenol and 2,4,6-tribromophenol. These bromophenols, the cause of iodoform-like off-flavours in seafoods, were found in eight of the above species; the largest total concentrations of bromophenols occurred in the commercially important species Nemadactylus douglasii (40 ng/g). The concentrations of bromophenols in another three species Branchiostegus wardi, Rhabdosargus sarba, and Girella tricuspidata, were found to exceed 10 ng/g while in a further four species their concentrations varied between 3 and 8 ng/g. However, these compounds were not identified in the remaining two species at a detection limit of 0.05 ng/g. The variations among fish diets suggest that the bromophenol content of individual fish can be explained by the relative contribution of benthic organisms and marine algae to the fish diet. Bromophenols were found in all of the benthic carnivores and diverse omnivores examined but were not detected in pelagic carnivorous fish.

Ecology of humic and non-humic dune lakes, Fraser Island, with emphasis on the effects of sand infilling in Lake Wabby

1986 ◽  
Vol 37 (6) ◽  
pp. 743 ◽  
Author(s):  
AH Arthington ◽  
HB Burton ◽  
RW Williams ◽  
PM Outridge
Keyword(s):  
Benthic Invertebrates ◽  
Abundant Species ◽  
Benthic Invertebrate ◽  
Food Resources ◽  
Eastern Region ◽  
Long Term Effects ◽  
Humic Lakes ◽  
Aerial Photos ◽  
Fish Diets ◽  
Dune Lakes

Aspects of physicochemical limnology and the zooplankton, littoral invertebrates and fish of dune lakes on Fraser Island are described and compared. The comparisons highlight differences between perched, humic lakes and the non-humic Lake Wabby, a water-table window with some morphometric and biological features typical of dune barrage lakes. Lake Wabby has been partially infilled by a mobile sand dune moving mainly in a north-westerly direction across the northern end of the lake. The maximum rate of dune advance estimated from aerial photos was 5.03 m year-1, between 1948 and 1958. Sand infilling between 1975 and 1984 altered the morphometry and substrate characteristics of the lake's eastern region and reduced maximum depth from 13.0 to 11.5 m and volume by 43%. The number of benthic invertebrates was reduced from 14 taxa in 1975 to six taxa in 1984; there was also a significant decrease in abundance of benthic Chironomini during this period (ANOVA, P < 0.05). In both years, an undescribed species of Conochironomus was the most abundant benthic invertebrate in Lake Wabby (250-700 individuals m-2). A new genus of Chironomini (near Paralauter borniella) was discovered. Lake Wabby supported 11 species of fish in 1975 and 1984, but the perched lakes had only one or two species. The five most abundant species in Lake Wabby in 1975 showed evidence of partitioning of food resources, of which the main components were benthic invertebrates and filamentous algae. Allochthonous food resources were not important in fish diets. The possible long-term effects of sand infilling on food resources, fish diets and the composition of the zooplankton in Lake Wabby are discussed.

scholarly journals Partial replacement of commercial fish meal with Amazon sailfin catfish Pterygoplichthys pardalis meal in diets for juvenile Mekong giant catfish Pangasianodon gigas

2018 ◽  
Vol 12 ◽  
pp. 25-29 ◽  
Author(s):  
Paiboon Panase ◽  
Seksan Uppapong ◽  
Siriluck Tuncharoen ◽  
Jakkaphan Tanitson ◽  
Kayanat Soontornprasit ◽  
...  
Keyword(s):  
Fish Meal ◽  
Partial Replacement ◽  
Commercial Fish ◽  
Pangasianodon Gigas ◽  
Giant Catfish ◽  
Mekong Giant Catfish

scholarly journals The Effects of Kefir Usage for Probiotic Purpose on Growth Performance of Brook Trout (Salvelinus fontinalis)

2018 ◽  
Vol 10 (11) ◽  
pp. 101
Author(s):  
Huriye Ariman Karabulut ◽  
Ilker Zeki Kurtoglu ◽  
Ozay Kose
Keyword(s):  
Survival Rate ◽  
Growth Performance ◽  
Brook Trout ◽  
Statistical Difference ◽  
Salvelinus Fontinalis ◽  
The Body ◽  
The Other ◽  
Control Group ◽  
Fish Diet ◽  
Commercial Fish

The effects of probiotically used kefir on growth, survival rate and meat yield characteristics of brook trout (Salvelinus fontinalis) were investigated in this study. For this purpose, kefir was added to trial diets at different rates 20 ml/kg feed (G2), 40 ml/kg feed (G3) while commercial fish feed was used as a control 0 ml/kg feed (G1). Total 270 fish with mean weight 24.38&plusmn;0.37 g were used during the experiment. Each group had three replicate, and 30 fish were placed in each tank. Experiment was carried on for 90 days. At the end of the experiment, some growth parameters, survival rate and meat yields of the groups were determined. The best weight gain (WG), specific growth rate (SGR), feed conversion ratio (FCR) and survival rate (SR) values were obtained in G2 (20 ml/kg) group (104.31&plusmn;0.11, 1.30&plusmn;0.08, 1.40&plusmn;0.18, 98.88&plusmn;0.51 respectively). At the end of the study, the differences between the control group and the other groups were not statistically significant in terms of FCR, Condition factor (CF) and survival rate (P &lt; 0.05). However, the differences between the control group and the other groups were statistically significant in terms of WG, WGR and Wf (P &lt; 0.05). The statistical difference between the G2 group and the G1 group was not significant at the SGR, whereas the statistical difference between the G2 group and the G3 group was significant (P &lt; 0.05). The body composition of the fish, hepatosomatic index (HSI), viscerosomatic index (VSI) values, fish meat crude protein and crude fat content were not affected by the addition of kefir to fish diet at different ratios. As a result, it was observed that the addition of kefir at 20% of the diet positively affected the growth performance and survival rate of the brook trout.

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