scholarly journals Study on physiological function of the rotifer Brachionus plicatilis sp. complex and its dietary effects for fish larvae

2007 ◽  
Vol 73 (3) ◽  
pp. 433-436 ◽  
Author(s):  
ATSUSHI HAGIWARA
Keyword(s):  
Brachionus Plicatilis ◽  
Physiological Function ◽  
Fish Larvae ◽  
Dietary Effects ◽  
Rotifer Brachionus Plicatilis

scholarly journals Total lipids content and fatty acids composition of the rotifer Brachionus plicatilis using artificial enrichments

2018 ◽  
Vol 68 (2) ◽  
pp. 181 ◽  
Author(s):  
J. A. THEODOROU
Keyword(s):  
Nutritional Value ◽  
Brachionus Plicatilis ◽  
Fish Larvae ◽  
Larval Growth ◽  
Total Lipids ◽  
Pufa Content ◽  
Live Feed ◽  
Significant Toxicity ◽  
Optimal Value ◽  
Rotifer Brachionus Plicatilis

Secondary feeding with commercial lipids enrichments such as the microencapsulated diets Diet A (33.42±3.00%) and Diet B (55.88±3.5%) compared with the marine yeast type product Diet C(8.59±1.0%) as a method of increasing the total lipids and ω-3 PUFA content of rotifers, hence enhancing their nutritional value as live feed prey for fish larvae in hatcheries. The total lipids the rotifers was affected analogous to the levels of these components in the feeds showing its maximum percentage uptake within 4 hours from the enrichment (20.27±3.52, 26.64±3.91, 11.31±2.30 respectively). There was not any significant toxicity to the animals due to the diets during the 16 hours experiment. The DHA/EPA for Diet A(1.31), Diet B(0.42) and Diet C(absent) as well as the DHA/EPA/ARA ratios for Diet A(10.70 ± 1.60 / 8.18 ± 1.10 / 2.08 ± 0.20), Diet B(6.20 ± 2.30 / 14.60 ±1.00 / 1.12 ± 0.40) and Diet C (0 / 5.14 ± 3.40 / 1.30 ± 1.10) indicates that Diet A is closer to the suggested DHA/EPA/ARA optimal value 10/5/1 for marine fish larval growth.

scholarly journals Nutritional enrichment of rotifer Brachionus plicatilis and its effect on clownfish larvae Amphiprion clarkii (Bennett, 1830)

2017 ◽  
Vol 64 ◽  
Author(s):  
Swagat Ghosh ◽  
T. T. Ajith Kumar ◽  
Bandana Das Ghosh ◽  
N. C. Sahu
Keyword(s):  
Brachionus Plicatilis ◽  
Fish Larvae ◽  
Maximum Growth ◽  
Amino Acid Derivative ◽  
Control Group ◽  
Larval Rearing ◽  
Growth And Survival ◽  
Rotifer Brachionus Plicatilis ◽  
Total Unsaturated Fatty Acid ◽  
Amphiprion Clarkii

The present study, evaluated the effect of enrichment of the rotifer Brachionus plicatilis with the microalga Nannochloroposis salina, amino acid derivative L-carnitine and commercially available S-presso (SELCO). The study also evaluated the effect of enriched rotifers in larval rearing of Amphiprion clarkii in terms of metamorphosis, pigmentation, growth and survival of larvae.. Rotifer production increased by 43, 39 and 54% respectively in B. plicatilis enriched with different concentrations of L-carnitine at 1, 10 and 100 mg l-1 on day 4 (p<0.001) in comparison with the control group maintained on algal diet alone. Total unsaturated fatty acid (PUFA, HUFA and n-3 fatty acids) and the ratios of n-3/ n-6, DHA/EPA, EPA/AA were significantly higher (p<0.05) in the L-carnitine treated rotifers compared with the S-presso enriched as well N. salina enriched groups. Larvae of A. clarkii, fed with L-carnitine enriched rotifer achieved maximum growth of 56.92±0.2 mg; whereas, those fed S-presso treated rotifers attained only 48.74±1 mg. In L-carnitine enrichment; metamorphosis of clown fish larvae took only 10 days, while it took 11 days and 10 days respectively in S-presso and N. salina enrichment. In L-carnitine and S-presso enrichments, initial pigmentation of larvae was observed within first 3-4 days of culture, whereas it took 4-5 days in N. salina enrichment. L-carnitine enrichment resulted in the highest survival of 70%, followed by N. salina with 68% and S-presso enriched group with 52%. The results indicate that L-carnitine could be a recommendable enrichment for increasing rotifer production as well as for clown fish larval culture.

scholarly journals Using the Marine Rotifer Brachionus plicatilis as an Endpoint to Evaluate Whether ROS-Dependent Hemolytic Toxicity Is Involved in the Allelopathy Induced by Karenia mikimotoi

Toxins ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 439 ◽  
Author(s):  
Yuanyuan Li ◽  
Jianfei Yu ◽  
Tianli Sun ◽  
Chunchen Liu ◽  
Yu Sun ◽  
...  
Keyword(s):  
Cell Suspension ◽  
Brachionus Plicatilis ◽  
Intact Cell ◽  
Cell Suspensions ◽  
Intrinsic Rate Of Increase ◽  
Spawning Period ◽  
Karenia Mikimotoi ◽  
Rotifer Brachionus Plicatilis ◽  
Hemolytic Toxicity ◽  
Marine Rotifer

The toxic effects of the typically noxious bloom-forming dinoflagellate Karenia mikimotoi were studied using the allelopathic experimental system under controlled laboratory conditions. The potency of intact cell suspensions with whole cells, cell-free culture filtrate in different growth phases, and lysed cells with ultrasonication were compared, and the growth and reproduction of the marine rotifer Brachionus plicatilis were used as endpoints to evaluate toxic differences. The intact cell suspension resulted the most significant growth inhibition, including lethality, on the growth of B. plicatilis (p < 0.05). Lysed culture medium treated with ultrasonication and the cell-free culture filtrates at either the exponential or stationary phase exhibited limited negative impacts compared to the control according to changes in the population growth rate (r) and survival rate (p > 0.05). Reproduction presented a similar tendency to change, and the number of eggs produced per individual, as well as spawning period decreased in the whole cell and lysed cell suspensions. The key parameters in the lift table include the net reproductive rate (R0) and the intrinsic rate of increase (rm), which were more sensitive to treatment and were significantly suppressed compared to that of the control. The addition of the ROS inhibitor N-acetylcysteine (NAC) could not change the growth or reproduction patterns. Moreover, substantial hemolytic toxicity was found in the treatment of the intact cell suspension (p < 0.05), while limited toxicity was found in other treatments compared to that of the control. K. mikimotoi was speculated to secrete allelopathic substances onto the cell surface, and direct cell contact was necessary for allelopathic toxicity in B. plicatilis. Reactive oxygen species (ROS)-independent hemolytic toxicity was assumed to be the explanation for what was observed.

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