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Now showing items 1161-1170 of 1211
Flakes versus noodles as feed for the abalone Haliotis asinina, does form matter?
(Wiley, 2021-12)
This paper reports the first use of thin flakes (310–315 μm thick) formulated diets as feed for the abalone Haliotis asinina. The study compared noodles and flakes prepared using refined and unrefined diets developed earlier ...
Genomic polymorphism in symbiotic populations of Photobacterium leiognathi
(Blackwell Publishing, 2004)
Photobacterium leiognathi forms a bioluminescent symbiosis with leiognathid fishes, colonizing the internal light organ of the fish and providing its host with light used in bioluminescence displays. Strains symbiotic with ...
Analysis of biosecurity-related policies governing the seaweed industry of the Philippines
(Springer Verlag, 2020-03-10)
The seaweed industry in the Philippines is a significant contributor to aquaculture production, both nationally and internationally. It out-produces the capture fisheries sector and most global producers, with the exception ...
Behavioural evidence for colour vision determined by conditioning in the purple mud crab Scylla tranquebarica
(Springer Verlag, 2020-01-04)
Crabs and shrimps (order Decapoda) use colours in various tasks such as foraging and mate choice. Colour vision requires at least two types of photoreceptors with different spectral sensitivities. Previous physiological ...
A social network analysis of the Philippine seaweed farming industry: Unravelling the web
(Elsevier, 2020-08)
Seaweed farming is a major economic endeavor among the households in the key seaweed-production areas in the Philippines because of its high profitability potential relative to farming effort. This study used Social Network ...
フィリピン・バタン湾におけるウシエビ放流の試み
(International Center for Research and Education in Agriculture, 2019-06-06)
Processes and results of stock enhancement of tiger shrimp performed in Batan Bay in Philippines was reported as a trans-disciplinary research for enhancement of area-capability (AC). Causes of decline in catch amount of ...
Reproductive quality evaluation of male Indian white prawn Penaeus indicus broodstock-fed diets supplemented with polychaete extracts (Marphysa sp.)
(Taylor and Francis, 2023-06-23)
The present study determined the effect of different polychaete extracts, namely, total soluble fraction (TSF), neutral lipid fraction (NLF) and polar lipid fraction (PLF), in the maturation and sperm quality of male ...
Behavior changes and \(\mathsf{LC_{50}}\) of dried garlic (Allium sativum) acute toxicity in Nile tilapia (Oreochromis niloticus) juvenile
(College of Agriculture and Food Science, University of the Philippines Los Baños, 2023-06)
Plant-based compounds are emerging substitutes for chemical treatments in aquaculture since they are known to cause less harm to both the environment and its organisms. Garlic (Allium sativum) is a popular herb that has a broad range of uses, especially in the control and treatment of bacterial and parasitic diseases. However, its toxicity to tilapia is not well-studied. Hence, this study was conducted to test the toxicity levels of garlic powder in juvenile Nile tilapia (Oreochromis niloticus) by determining the cumulative mortality and median lethal concentration (LC<sub>50</sub>). Test fish were exposed through immersion in 6 concentrations (150, 200, 250, 300, 350, and 400 mg L<sup>-1</sup>) of garlic powder with 25% allicin and a control in 96 h static bioassay. Within 24 h, test fish exposed to 250 mg L<sup>-1</sup> garlic and above, exhibited abnormal behaviors such as lethargy, gasping for air, and weak responses to environmental stimuli. Cumulative mortality was highest at 100% in 400 mg L<sup>-1</sup> garlic at 48 h. Mortalities were dependent on the concentration and duration of exposure. The 96 h LC<sub>50</sub> of garlic powder to O. niloticus is 225.86 mg L<sup>-1</sup> with lower and upper confidence limits of 210.37 and 242.50 mg L<sup>-1</sup>, respectively at 27°C....
Alternate day feeding as a cost-effective strategy for tank culture of the Pacific shortfin eel Anguilla bicolor pacifica
(College of Agriculture and Food Science, University of the Philippines Los Baños, 2023-09)
There is a growing interest in the aquaculture of tropical anguillid eels as an export commodity. However, studies on feeding strategies, and the present demand to reduce feed costs need to be addressed to ensure the ...
In vitro and in vivo evaluation of the efficacies of commercial probiotics and disinfectant against acute hepatopancreatic necrosis disease and luminescent vibriosis in Litopenaeus vannamei
(Elsevier, 2024-05)
The bioactivities of two commercially available probiotics and one chemical disinfectant were tested against strains of Vibrio parahaemolyticus (VP<sub>AHPND</sub>) and V. harveyi. This study aimed to determine shrimp pathogenic Vibrios' in vitro and in vivo sensitivities to commercial probiotics and a chemical disinfectant. The probiotics and disinfectant were tested first in vitro, followed by the in vivo trials. Results showed that upon administration of probiotics either through diet or adding into the tank water, the survivability of shrimp was increased during challenge with VP<sub>AHPND</sub> and V. harveyi. Also, the disinfectant was tested against the same pathogens and showed positive bactericidal effects at 2500 ppm and 5000 ppm. The present findings suggest that adding probiotics to the rearing water or the shrimp feeds effectively prevents infection by lowering the load of pathogenic bacteria. In comparison, the effectiveness of the disinfectant (PUR) depends on its appropriate concentration and timing of application. It is not only limited to rearing water but is also applicable for decontaminating pond liners, tanks, and other paraphernalia....