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Selected issues facing fishers and aquaculturists 73 States. The IATTC has maintained a spawning broodstock of yellowfin tuna (Thunnus albacares) on an experimental scale in Panama since 1996, and experimental work on optimizing the conditions for larval tuna rearing is ongoing. Natural spawning of wild-caught greater amberjacks (Seriola dumerili) and the longfin or Almaco jack (S. rivoliana) was achieved in Hawaii, United States, in 1999; since then, domesticated F1 and F2 stocks have been used as broodstock. The survival of hatchery-produced fingerlings of various marine finfish species cultured in Asia, including groupers, has until recently been low and variable. However, there has been a significant expansion of grouper fingerling production in Indonesia, for example, mainly from “backyard hatcheries” in Bali; the principal output of these hatcheries had formerly been another species that was once stocked with wild seed, namely milkfish (Chanos chanos). It is estimated that 15–30 percent of the farmed groupers in Indonesia now come from hatchery-reared seed. There appears to be little immediate hope that seed for eel CBA can be provided through a commercially feasible closure of its life cycle. However, it has been reported that research success, at least for Anguilla anguilla, is within sight. 32 Feed developments CBA producers are usually reluctant to change feeding practices; the possible failure of alternatives when so much is at stake economically (especially in bluefin tuna production) means that many fear to take the risk. Despite this, there are moves towards the partial substitution of raw fish by manufactured diets. Research on tuna diets has been ongoing in Australia since 1997 but has been hampered by the difficulties of conducting controlled experiments with such valuable fish. High feed production costs and the suboptimal acceptance of pelleted feeds by tuna have also proved problematic. In addition, a degree of consumer resistance to tuna (and other species produced by CBA) that have been fed using “artificial” feeds has been encountered. In 2004, at the World Aquaculture Society exposition in Hawaii, United States, an American feed company exhibited a tuna feed being used in Mexico as a supplement at 25–50 percent of the diet; moreover, some farmers were said to be “looking at feeding a 100 percent dry diet to their tuna”. Intensive eel farms, while continuing to use small aquatic worms and fish flesh for the first few days of elver rearing, move through a transitional phase of feeding an artificial moist paste feed subsequently followed by steam-pressed or extruded pellets for on-growing purposes. Raw (“trash”) fish remains the most commonly used type of feed for groupers, despite decades of research aimed at producing pelleted substitutes. Nevertheless, attempts at marketing commercial grouper feeds continue; for example, following a successful commercial-scale experiment with the orange-spotted grouper (Epinephelus coioides), one aquafeed manufacturer began selling a grouper feed in the Philippines in 2002. Raw fish is still used in the CBA of yellowtails in Japan but, since farmers became aware of the environmental damage caused by this practice in the early 1990s, its substitution by moist, semi-moist and “soft-dry” pellets and extruded pellets has been increasing. By 1998, over 120 000 tonnes of artificial feeds were being used. A suitable artificial feed for yellowtails that exceed 3 kg in weight has yet to be identified; these fish exhibit a strong preference for raw fish over extruded pellets. The need for the partial or complete replacement of marine resources as aquafeed ingredients is not restricted to CBA but is relevant to the rearing of all carnivorous fish and crustacean species. 33 32 Anonymous. 2003. Dana Feed Research Project: reproduction of European eel is almost within reach. Eurofish, 2/2003: 36. 33 FAO. 2002 Use of fishmeal and fish oil in aquafeeds: further thoughts on the fishmeal trap, by M.B. New and U.N. Wijkström. FAO Fisheries Circular No. 975. Rome.
74 The State of World Fisheries and Aquaculture 2004 FUTURE PERSPECTIVE CBA is an economic activity that is likely to continue to expand in the short term, both with finfish species currently under exploitation and probably with others that will be selected for rearing in the future. In the case of non-finfish species, such as a variety of bivalves (e.g. mussels), CBA is certain to continue indefinitely in view of the very large number of gametes released. However, the CBA of selected species of finfish is more uncertain; where it becomes a direct competitor of capture fisheries there will be many who will argue, at least, for strict limits to this activity. It is therefore critically important that economically viable means be found to rear the species concerned throughout their full life cycle. When that goal is achieved, not only will the future aquaculture production of those species be assured, but the feasibility of restocking programmes may be explored to enhance their capture fisheries. While opportunities exist for market expansion for species currently reared through CBA, there is a tendency (as has occurred in the aquaculture of salmon, sea bass, and sea bream, for example) for farm-gate prices to decline as the supply increases. Thus, expansion will only be feasible if farmers are able to reduce costs. The main technical constraint to expansion is seed supply. In the case of tuna CBA, future expansion will be constrained by limited fishery quotas. Eel farming is already constrained by the shortage of seed and future expansion is likely to be limited by controls over elver capture. Damage to the environment (e.g. by the collection of grouper seed) may also result in controls that will limit expansion. There is enhanced interest in yellowtail farming but, again, seed supply is a limiting factor. The potentially positive long-term benefits of CBA should not be ignored. As grouper culture metamorphoses from CBA to true aquaculture in Indonesia, the supply of hatchery-reared juveniles is causing fishers to replace the cyanide harvesting of aquarium fish with aquaculture of reef fish. This development has positive implications for the future of reef fish culture as an alternative to destructive capture fisheries practices – not only in Indonesia but globally. More research, development and capacity building in the private and public sectors are essential for success in this area. Researchers worldwide have been working for many years on the reproductive cycles of many species, achieving results that range from a hint of success in the case of eels to partially successful ones in the case of bluefin tunas and selected species of groupers. These studies will become even more important if capture fisheries for the species used as wild seed for CBA become threatened, as has happened in the case of eel fisheries. A ban on the capture and export of elvers may result; if this occurs, the farming of eels will cease unless a feasible means of rearing them artificially to the required stocking size becomes available. In conclusion, critical issues for the future are the development of fry production in hatcheries on an economically viable commercial scale and the refinement of environmentally acceptable grow-out technologies. Failure to address these could have severe consequences for the future of both aquaculture and some capture fisheries. Labour standards in the fishing sector THE ISSUE One of the most significant changes in marine fishing over the last 40 years has been the changing status of fisheries resources. Burgeoning demand for fish, in conjunction with technological innovations in fishing and navigation, especially in the absence of effective fisheries management, has led to a situation where there is little scope for increasing fish production from capture fisheries. This has serious implications for employment in the fishing sector. The emphasis, according to the ILO, is now changing from maximum employment to sustainable employment. At the same time, the global fleet is aging – with consequent effects on the occupational safety and health of crews.
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CONTENTS Foreword Acknowledgements
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vii TABLES Table 1 World fisheries
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ix Figure 23 Total protein supply b
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ACKNOWLEDGEMENTS The State of World
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xiii IATTC Inter-American Tropical
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3 WORLD REVIEW OF FISHERIES AND AQU
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World review of fisheries and aquac
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PART 4 OUTLOOK
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