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Updates on the seed production of mud crab

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QuinitioET2015.pdf (153.1Kb) Open Access
Downloads: 1,692
Date
2015
Author
Quinitio, Emilia T.
Parado-Estepa, Fe D.
Huervana, Joana Joy
Burlas, Michael Ray
Page views
13,286
Subject
starvation ASFA
seed (aquaculture) ASFA
stress ASFA
feeding ASFA
mortality ASFA
trade ASFA
feeds ASFA
domestication ASFA
seed production ASFA
cultured organisms ASFA
larval stage ASFA
crab culture ASFA
aquaculture economics ASFA
hatcheries ASFA
rearing techniques ASFA
nursery ponds ASFA
fish diseases ASFA
feeding experiments ASFA
crustacean larvae ASFA
Scylla tranquebarica AGROVOC
Scylla serrata AGROVOC
Scylla olivacea AGROVOC
Mud crab
Quality seed stocks
Philippines AGROVOC
Taxonomic term
Scylla serrata GBIF
Scylla GBIF
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Abstract
Widespread interest in mud crab species is increasing because these are highly prized both in domestic and export markets. Among the three mud crab species commonly found in the Philippines, Scylla serrata, S. olivacea, and S. tranquebarica, S. serrata is preferred by farmers because it is larger and less aggressive than the other species. Likewise, S. serrata is the most widely distributed species in the Indo-west Pacific region.

Hatchery-produced seedstock are presently used by some crab farmers in their grow-out operations. In the hatchery phase, feeding mud crab larvae with shrimp formulated diets and natural food was found to reduce the occurrence of molt death syndrome, one of the major problems in seed production. Larvae given 25% formulated diet (FD) + 75% natural food (NF; rotifers and Artemia) and 50% FD + 50% NF showed better performance than those larvae fed 100% FD, 100% NF and 75% FD + 25% NF indicating that usage of natural food, especially the expensive Artemia, can be reduced. Since the early crab instar (C) produced in the hatchery need to be grown further before stocking in grow-out ponds, two phases of nursery culture have been developed. C1-2 are grown to 1.5-2.0 cm carapace width (CW) size in the first phase and further grown to 3.0-4.0 cm CW in the second phase. Nursery rearing is done in net cages installed in ponds for easy retrieval. A combination of mussel or trash fish and formulated diet is used as feed.

Domestication of the mud crab S. serrata as a prerequisite to selective breeding has been done at SEAFDEC/AQD. Likewise, defining criteria for the determination of quality of newly hatched zoeae for stocking in the hatchery was initiated. Newly hatched zoeae were subjected to starvation and stress test using formalin. Starvation failed to elicit responses that were significantly different between the good and poor quality larvae hence it is not suitable for larval quality evaluation. Based on three-year data, the formalin stress test gave mean cumulative mortalities of 2.38±0.32, 8.24±0.88, 20±1.58 in good quality larvae, and 43.74±2.39 while 22.93±4.19, 63.68±7.17, 84.29±3.88 and 97.65±1.06 for poor quality larvae at 0 (control), 20, 30 and 40 ppm formalin, respectively. As formalin level increased, cumulative larval mortality also increased regardless of the quality of the larvae. Formalin stress test proved to be a reliable method to determine whether a batch of newly hatched zoeae was of good or poor quality.
URI
http://hdl.handle.net/10862/2775
Suggested Citation
Quinitio, E. T., Parado-Estepa, F. D., Huervana, J. J., & Burlas, M. R. (2015). Updates on the seed production of mud crab. In M. R. R. Romana-Eguia, F. D. Parado-Estepa, N. D. Salayo, & M. J. H. Lebata-Ramos (Eds.), Resource Enhancement and Sustainable Aquaculture Practices in Southeast Asia: Challenges in Responsible Production of Aquatic Species: Proceedings of the International Workshop on Resource Enhancement and Sustainable Aquaculture Practices in Southeast Asia 2014 (RESA) (pp. 207-212). Tigbauan, Iloilo, Philippines: Aquaculture Dept., Southeast Asian Fisheries Development Center.
Type
Conference paper
ISBN
9789719931041
Collections
  • Proceedings of the International Workshop on Resource Enhancement and Sustainable Aquaculture Practices in Southeast Asia 2014 (RESA) [56]

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