* ICLARM is now known as WorldFish Center

Naga - The *ICLARM Quarterly
Vol. 22, No. 1 (January - March 1999)

Network of Tropical Aquaculture Fisheries Professionals (NTAFP) Section

Aquabyte (Aquaculture Section of NTAFP)

This issue contains papers dealing with causative agents for epizootic ulcerative syndrome in finfish, ecology and feeding habits of some aquaculture species and hybridization as a method for increasing growth in groupers, all elements with a potential for increasing aquaculture production. The emphasis today is on research aimed not only at increasing production but also sustaining the ecological integrity of aquatic resources for sustained production. Discussions in symposiums held recently and planned for the near future highlight this emphasis. I am sure that network members are giving due importance to this aspect in their research.

Dr. M.V. Gupta

Is Epizootic Ulcerative Syndrome (EUS) Specific Fungus of Fishes a Primary Pathogen? - An Opinion
C.V. Mohan, K.M. Shankar and K.S. Ramesh

Earlier findings on epizootic ulcerative syndrome (EUS) and the present observation of the authors on transmission of EUS to snakehead (Channa sp.) without skin damage provide evidence to suggest that the invasive fungus associated with EUS is a primary pathogen.

C.V. Mohan, K.M. Shankar and K.S. Ramesh are from the Fish Pathology Laboratory, Department of Aquaculture, College of Fisheries, Mangalore 575 002, India.

Potential of Grouper Hybrid (Epinephelus fuscoguttatus x E. polyphekadion)  for Aquaculture
C.M. James, S.A. Al-Thobaiti, B.M. Rasem and M.H. Carlos

The marine grouper species are considered high value food fish in several countries. However, controlled breeding and hatchery production of grouper fingerlings for commercial farming is still in its infancy. Investigations on the growth performance of the brown marbled grouper Epinephelus fuscoguttatus (Forskal), camouflage grouper E. polyphekadion (Bleeker) and their hybrid (E. fuscoguttatus x E. polyphekadion) under hatchery and growout culture conditions indicate the potential of grouper hybrids for aquaculture.

C.M. James, S.A. Al-Thobaiti, B.M. Rasem and M.H. Carlos are from the Fish Farming Centre, Ministry of Agriculture and Water and FAO Under Secretariat for Fisheries Affairs, PO Box 9612, Jeddah 21423, Kingdom of Saudi Arabia.

Study on Feeding Habits of Piaractus mesopotamicus (Pacu) Larvae in Fish Ponds
L.H. Sipaúba-Tavares and F.M. de S. Braga

A limnological study of an artificial fish pond and an analysis of the stomach contents of pacu (Piaractus mesopotamicus) larvae of 2 to 45 days age were made for a period of 45 days to evaluate their feeding preferences. A preference for chlorophytes and rotifers was noted, while other planktonic species remained constant in the stomach contents. Some limnological variables were found to have a strong influence on the feeding behavior of the pacu. A preference for feeding on smaller species in the first few days of larval development was also noted.

L.H. Sipaúba-Tavares is from Universidade Estadual Paulista (UNESP, Centro de Aqüicultura), Rodovia Carlos Tonanni km 14870-000, Jaticabal, SP, Brazil. F.M. de S. Braga is from Universidade Estadual Paulista (UNESP, Depto. De Zoologia), Av. 24 A 1515, 13500-000, Rio Claro, SP, Brazil.

Preliminary Observation on Culture of Penaeus monodon in Low-Saline Waters
S.B. Saha, S.B. Bhattacharyya and A. Choudhury

The feasibility of semi-intensive culture of Penaeus monodon in low saline environment was investigated by comparing the growth and production in low (0.16 - 6.52 ppt) and high (4.60 - 19.42 ppt) saline areas at two stocking densities (10.5 and 16 individuals/m2). After 135 days of culture, yield of shrimp in low and high stocking densities was 1 563.37 kg/ha and 2 274 kg/ha, respectively, in low saline ponds, and 1 173.00 kg/ha and 1 974.00 kg/ha, respectively, in high saline ponds. Food conversion ratio (FCR, 1.31 - 1.58) and specific growth rate (SGR 21.04 - 21.19%) were higher in low saline ponds as compared to high saline ponds (FCR, 1.35 - 1.68; SGR, 19-22 - 19.88%). Growth of shrimp was satisfactory in low saline ponds even when salinity decreased after 60 days of culture to almost freshwater level (0.16 ppt) indicating the viability of semi-intensive culture of P. monodon in low saline environment.

S.B. Saha is a Senior Scientific  Officer of Bangladesh Fisheries Research Institute, Rangamati - 4500, Bangaldesh; S.B. Bhattacharyya is Farm Manager, Mari-Gold Aqua, Haroa, 24-Parganas (N), WB, India and A. Choudhury is General Secretary, S.D. Marine Biological Research Institute, Bamankhali, Sagar Island -743 373, 24-Parganas (S), WB, India.

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