| Naga
- The *ICLARM Quarterly
Vol.
22, No. 1 (January - March 1999)
Network
of Tropical Aquaculture Fisheries Professionals
(NTAFP)
Section
Aquabyte
(Aquaculture Section of NTAFP)
Editorial
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
*ICLARM
Is
Epizootic Ulcerative Syndrome (EUS) Specific Fungus
of Fishes a Primary Pathogen? - An Opinion
C.V.
Mohan, K.M. Shankar and K.S. Ramesh
Abstract
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
Abstract
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
Abstract
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
Abstract
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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