Water Quality Issues in the Fishing Grounds

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2.3.5 Water Quality Issues in the Fishing Grounds

The bloom of algae Enteromorpha spp in the coastal waters of the Western Region has been of national concern for nearly 20 years. The bloom seriously curtails fishing activities and fuels food insecurity and poverty in the impacted communities from the estuary of the Akobra river to Newtown on the border with Ivory Coast and well into the coastal towns of Ivory Coast. Previous occurrences of the bloom lasted a few weeks to a few months. However, the 2010 incidence was unprecedented as the bloom lasted the whole year. Earlier investigations conducted by government agencies on the drivers of the bloom have been inconclusive. In Year 2, 20102011 the CRC committed resources and expertise to contribute to knowledge on the possible drivers of the algal bloom phenomenon. Figure 21: Dragnet fishermen landing green algae in their nets In Box 11 is presented the preliminary findings of scientific investigations on occurrence of the algal bloom conducted by CRC and its partners. The findings and the necessary follow-up advice have been made submitted to the Honourable Minister of Environment Science and Technology and the National Task Force on the green algae in Accra. Also CRC has established contacts and have visited Ivory Coast to meet scientists there to discuss possible collaboration and opportunities of working together on the green algae which is hypothesized to originate from that country. 43 Box 12: Research on Green-Green The green algae bloom green-green in the Western Region has been of national concern since 1993. Scientific studies conducted by Ghanaian institutions to determine the drivers of the phenomenon have been inconclusive but generally acknowledge that nutrients especially Nitrogen fuel the bloom. Analyses of water samples taken during bloom events have indicated slightly elevated levels of Nitrogen but did not implicate any source. It was however speculated that the nutrients may be from either 1 agricultural run-off or 2 other land-based sources in Ivory Coast. For many years, efforts at collaborative investigations with scientist from Ivory Coast have been unsuccessful. Learning and experiences from Year 1 of Hɛn Mpoano activities compelled CRC to solicit assistance from expert institutions in Rhode Island, USA the Graduate School of Oceanography, URI and US-EPA for a refined study. This study was guided by 3 assumptions. That the nutrients may be from: 1 oceanic processes 2 agricultural fertilizers 3 municipal sewage. Nutrients from these different sources exhibit different signatures of the Nitrogen isotope δN 15 . In December, 2010, algae, water both near shore and offshore and fish were taken from the Ankobra estuary westwards to Newtown border with Ivory Coast to Rhode Island USA for analysis. The US-EPA assisted with the Isotope analysis which is an expensive laboratory exercise. Preliminary results indicated consistently high levels of sewage δN 15 isotope. The results are only preliminary and further studies would be conducted when the bloom returns. It is hoped that further studies would involve Ghanaian and Ivorian scientists. An interim report has been submitted to the Minister of Environment Science and Technology MEST and the Task Force on the green-green. Constraints: The political impasse in Ivory Coast did not allow for studies in that country. Meanwhile, CRC has advised the Government of Ghana through the Minister of Environment Science and Technology to initiate bilateral talks with the government of Ivory Coast to pave the way for joint investigations on the algal bloom phenomenon. --------------------------------------------------------- Nitrogen-15 N 15 : Natural Nitrogen N consists of two stable isotopes, N 14 , which makes up the vast majority of naturally-occurring nitrogen, and N 15 . Nitrogen-15 is a stable, non-radioactive isotope of Nitrogen. It is often used in agricultural and medical research. Nitrogen-15 is extensively used to trace mineral nitrogen compounds particularly fertilizers in the environment and when combined with the use of other isotopic labels, is also a very important tracer for describing the fate of nitrogenous organic pollutants. 44

2.4 Component 4: Capacity Building for the Governance of the Coastal Zone and