Aquaculture and biodiversity

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Presentation transcript:

Aquaculture and biodiversity WP5 Aquaculture and biodiversity Developing principles for aquaculture of introduced species

Purpose Brief about the use of introduced species for aquaculture in the Pacific Islands region;   Highlight issues stemming from apparent tensions between biodiversity and food security;  Seek the views and support of Heads of Fisheries for SPC, in conjunction with national and regional stakeholders, to address these issues relating to use of introduced species in regional aquaculture.

Introduced species in Pacific aquaculture Aquaculture for food security and rural livelihoods is a priority sector for most PICTs For the majority of PICTs a growing “fish gap” is forecast, between the fish that can be supplied by depleted and climate-change affected coastal fisheries and that demanded by increasing populations.

Domesticated species Globally the number of species that can be domesticated, and have agronomic traits suitable for agriculture or aquaculture, is quite small. Domestication and husbandry makes possible selection for genetic improvement Improved varieties of these relatively few species then have their geographical ranges extended beyond their original distributions, to help increase global food production.

PICT examples in agriculture Pigs Chickens Cattle Goats Pasture grasses Forestry trees Bio-diesel plants (Jatropha sp.) Damaging to the environment, has contributed to some bird extinctions Many pasture grasses are highly invasive Clearing trees to make pasture is a major environmental modification Source: SPREP-SPC Guidelines for Invasive Species Management in the Pacific

Top-5 aquaculture commodities in PICTs Tilapia Oreochromis niloticus Freshwater prawn Macrobrachium rosenbergii Seaweed Kappaphycus alvarezii Blacklip pearl Pinctada margeritifera Marine shrimp Litopenaeus stylirostris

Introduced from outside of the region: Tilapia Oreochromis niloticus Freshwater prawn Macrobrachium rosenbergii Seaweed Kappaphycus alvarezii Blacklip pearl Pinctada margeritifera Marine shrimp Litopenaeus stylirostris

Recent requests for advice SPC continues to receive requests from member PICTs for information about possible introduction of species for aquaculture, for example: An improved variety of Kappaphycus seaweed; Barramundi fish Australian freshwater crayfish GIFT Nile tilapia.

“Farm our own species first” It is advisable to utilise an indigenous or already-established species for aquaculture wherever possible, to avoid environmental or economic risks from species introductions. However, in many places there are no already-present species capable of fulfilling aspirations for efficient agriculture or aquaculture food production. This is the main driver for introductions

If an introduction is being considered: Adoption of modern approaches to Risk Assessment are strongly urged, to ensure that decisions to introduce a species for aquaculture are science-based, consultative, and provide as full an appreciation of the risks as possible. If risks are being weighed against benefits, then the case for the likelihood of benefits being achieved should be a strong one.

Tilapia: a key example Tilapia is recognised as one of a very few fish species with good all-round culture characteristics (hardy, easy to breed, rapid-growth, omnivorous diet) Tilapia will presently be counted among the select handful of crops that can help provide animal protein at low cost.

Tilapia “invasive”? The same characteristics (hardy, breeds easily, grows rapidly, etc.) can also contribute one of two elements necessary for a species to be considered “invasive”. The second necessary element is that the species causes environmental or economic harm, or harm to human health. The scientific literature still contains unresolved differences about whether, and to what extent, tilapia causes any harm to freshwater ecosystems.

Biodiversity and Food Security Internationally there are tensions and contradictions emerging between: the need to produce more fish for food security through fisheries and aquaculture, and the potential effects of fisheries and aquaculture development on biodiversity.

For example: International initiatives to protect aquatic biodiversity typically call for reductions in the amount of fishing, and/or only local species to be used for aquaculture. International initiatives to protect food security call for fisheries production to be sustained or increased, and use of the most efficient varieties for aquaculture.

Another 2 billion people by 2050 Since 1990 the global increases in total world fish production up to present-day levels have been achieved entirely through aquaculture production. Maintaining this growth in future will depend upon development and dissemination of specialized species and varieties adapted for low-cost pond culture and low-protein diets.

Potential contradictions exist in Pacific regional and national initiatives The 2010 Framework for Action on Food Security in the Pacific calls for PICTs to “Promote commercial aquaculture to supply farmed fish to urban markets; continue to support inland aquaculture where appropriate.” (Theme 3, Strategy 2, Action 7) But also to “Strengthen biosecurity and quarantine systems to curb the import of invasive species, pests and diseases and to respond as necessary at national and regional levels” (Action 1).

Responsible use of tilapia Tilapia is the obvious species on which to base development of pond aquaculture, if PICTs continue to place priority upon this sector to meet future food-security needs.  In line with the “precautionary principle” and until more scientific information is available to support assessments of “harm”, it is prudent for the time-being to adopt policies that discourage further introduction or spread of tilapia to places where it is not yet established.

Reconciling the tensions – key questions: Does tilapia cause “harm” to aquatic biodiversity or other values among PICTs? If so then how does this compare with other potential sources of “harm” to aquatic biodiversity or environmental quality? (e.g. de-forestation, unsustainable land practices, fishing with chemicals) Where Mozambique tilapia is already long-established, will the introduction of Nile tilapia for aquaculture have any significant new effects on biodiversity that were not already there before their introduction?

How do any additional effects compare with the potential benefits of pond aquaculture that uses a suitable variety of tilapia to help fill the food security gap? Which PICTs are most in need of the potential benefits of aquaculture using an improved tilapia variety? Are there viable local-species alternatives that could efficiently deliver food-security benefits through application of aquaculture techniques?

Fisheries Heads are invited to: Reaffirm that the decision on whether or not to introduce exotic species or new strains of previously introduced species for aquaculture is a national responsibility; Note the importance of considering carefully the potential benefits and risks of any such introduction, including an appropriate risk assessment;

Fisheries Heads are invited to: Agree that, for the time being and until more scientific knowledge is available, further introduction and spread of tilapia to countries and catchments where it is not yet established should be discouraged; Encourage research to determine whether Nile tilapia introduced for aquaculture to areas where Mozambique tilapia is long-established will cause any significant new effects on biodiversity that were not already there before their introduction.

Fisheries Heads are invited to: Agree that there be review of the potential for the use of indigenous, rather than introduced, species for aquaculture; Affirm that a complete prohibition on any new introductions is not consistent with international practices of food production.