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ACKNOWLEDGEMENTS

The author wishes to record his most sincere gratitude to his Indonesian fisheries colleagues who have on numerous occasions made extra efforts under difficult circumstances in providing him with invaluable assistance. Their names are too numerous to mention. In particular, he wishes to thank his counterparts, Messrs. Soeyanto Tirtosoehardjo and Abdul Rahman, for their most valuable contributions and untiring efforts.

To Dr. Herminio R. Rabanal, Aquaculture Consultant, South China Sea Fisheries Programme, Manila, the author is especially indebted for his assistance and guidance expressed in many ways.

Table 1. Inter-relationships between the choice of species and the associated economic aspects in cage culture (1)
Species
(1)		Value (Rp) at 605 gm)
(2)		Weight at 1st stocking (gm)
(3)		Av. daily weight increment (gm)
(4)		No. of days required to attain 605 gmNo. of crops per year
(5)		Biomass at harvest (no. of 605 gm fish per m3)Annual value of harvested fish/m3
(Rp) (6)		Natural habitats (7)
Brackish (above 15‰MarineCoral reef
Epinephelus tauvina2 400105–150(125)41202–3 (2.5)17–25 (21)126 000FryJuv./adultJuv./adult
E. malabaricus2 400"41202–3 (2.5)17–25 (21)126 000   -All sizesAll sizes
E. fuscoguttatus1 800"41202–3 (2.5)17–25 (21)94 500   --All sizes
Lutjanus argentimaculatus1 800"41202–3 (15)13–17 (15)67 500Fry/juv.Juv./adult-
Lutjanus sanguineus1 800"31602 (2)13–17 (15)54 000   -All sizesAll sizes
Lutjanus johni1 800"31603 (2)13–17 (15)54 000FryJuv./adult(less common)
Lates calcarifer(8)2 400"6–7 (6.5)744–5 (4.5)6–8 (7)75 600All sizesAdult-
Psammoperca waigiensis1 500"1.53201 (1)7–9 (8)12 000   ---
Plectropomus maculata2 400"41202–3 (2.5)17–25 (21)126 000   -(less common)All sizes
P. leopardus2 400"31202–3 (2.5)17–25 (21)126 000   -(less common)All sizes
Siganus spp. other than S. fucescens and oramin6 000"1.53201 (1)17–25 (21)126 000   --All sizes

(1) A summary list of potential cage culture fish species for the southern Bintan Island area, and the likely events (if collectively considered) to justify the selection of species. Justification emphasizes on likely economic return.

(2) Based on likely value to the fish farmer from Singapore-based fish collectors/agents for sales in Singapore. 605-gm. or catty size fetching optimum value.

(3) A size from which optimal growth begins, based on serranids and lutjanids.

(4) Attainable through good, effective management.

(5) A likely event depending on availability of fingerlings and the dedicated efforts of the fish farmer.

(6) Value of 605-gm fish × number of fish per m3 at harvest × number of crops per year, being annual gross revenue from each m3.

(7) To generalize the distribution of the fry, juvenile and adult of the species with a view to illustrating the relative suitability of a site for each of the listed species.

(8) This species is a fast-growing one, but there are many problems requiring intensive technical input particularly at the fry stages.

Table 2. Factors concerned with the eventual optimization of annual gross profit, with special emphasis on the role of dependent and independent Variables in cage culture investments

Fig. 1

Fig. 1 Southern part of Bintan island, Riou province showing the locations of the six selected sites

Fig. 2

Fig. 2 Teluk Lampung, showing the five sites in the bay off Batimenyan, Sumatra

Fig. 3

Fig. 3 Potential cage culture sites in northeast Bali, showing the location of Teluk Gilimanuk and the deep cave east of Grogok, Bali Island

Fig. 2

Fig. 2 Southeastern tip of east Java



Fig. 4b

Fig. 4b Grajagan Bay, Peturon Bay and the Segara Anakan, East Java showing the vigorous mixing of marine and estuarine waters at the mouth of the latter

Fig. 4a

Fig. 4a Pangpang Bay, East Java, showing its deep indentation, breakwater, and the densely populated western shore

Fig. 5




Fig. 5

Fig. 5 Genteng Bay of Gili Genteng, southeast of Madura proper, East Java, showing location of coral reefs and the deep wide channel in between to provide excellent sites for location of floating fish cages

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