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Strategies to reduce disease incidence in mud crab culture

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Abstract (177.7Kb) Open Access
Downloads: 13
Date
2017
Author
Amar, Edgar C. ORCID
Somera, Mechil D.
Madero, Sherlyn B.
Tendencia, Eleonor ORCID
Faisan, Joseph P., Jr. ORCID
Page views
5,947
ASFA keyword
antibiotics ASFA
bacterial diseases ASFA
bioactive compounds ASFA
crab culture ASFA
developmental stages ASFA
disease control ASFA
growing ponds ASFA
hatcheries ASFA
husbandry diseases ASFA
larvae ASFA
marine crustaceans ASFA
metamorphosis ASFA
mortality ASFA
moulting ASFA
pond culture ASFA
probiotics ASFA
disease prophylaxis ASFA
survival ASFA
therapy ASFA
zoeae ASFA
AGROVOC keyword
Scylla AGROVOC
Philippines AGROVOC
Taxonomic term
Terminalia catappa GBIF
Vibrio harveyi GBIF
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Abstract
Mud crab hatchery suffers from low survival due to susceptibility to bacterial infection in the early larval stages among many causes. Despite food safety issues, antibiotics continue to be used in the absence of effective alternatives. In this study, screening of plant extracts was conducted to determine their suitability as antimicrobial agents against pathogens causing low survival in the hatchery. In addition, potential probionts were isolated from the gastrointestinal tract of mud crab, and water and sediments of mud crab grow-out ponds.

Crude ethanolic extracts from various terrestrial and mangrove trees were tested for in vitro antimicrobial activity and toxicity to mud crab zoea and megalopa. In addition, the in vivo antimicrobial efficacies of the selected extracts were tested by oral administration followed by experimental challenge with Vibrio harveryi. On the other hand, the putative probionts, were tested for pathogenicity against mud crab zoea and megalopa and quorum sensing inhibition activity against V. harveyi. Finally the extracts and probionts were tested for their efficacy in simulated hatchery and grow-out trials.

Results showed that extracts of Terminalia cattapa and the potential probiont Bacillus subtilis G100R11 showed antimicrobial and probiotic activity in in vitro and in vivo tests. In simulated hatchery trials, T. cattapa administration successfully produced crab instar with a survival of 1.3-1.8% in trials 1 and 2 comparable to antibiotic control. B. subtilis produced crab instar with survival of 0.8-1.0% in trials 1 and 2, better than the commercial probiotic with 0-0.13% survival. Using T. cattapa and B. subtilis, survival was above 30% until zoea 5 but suddenly dropped below 5% during metamorphosis to megalopa where high incidence of incomplete molting was observed. If difficulty affecting the molting process is addressed, high survival from zoea to megalopa and crab instar will be achievable.
Description
Abstract only.
URI
http://hdl.handle.net/10862/3189
Suggested Citation
Amar, E. C., Somera, M. D., Madero, S. B., Tendencia, E. A., & Faisan Jr., J. P. (2017). Strategies to reduce disease incidence in mud crab culture. In E. T. Quinitio, F. D. Parado-Estepa, & R. M. Coloso (Eds.), Philippines : In the forefront of the mud crab industry development : proceedings of the 1st National Mud Crab Congress, 16-18 November 2015, Iloilo City, Philippines (p. 154). Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center.
Type
Conference paper
ISBN
9789719931072
Collections
  • Philippines : In the forefront of the mud crab industry development [44]

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