Effect of freshwater toxic and non toxic cyanobacteria, (Microcystis aeruginosa) strains on some biochemical parameters of Oreochromis niloticus

This study was planned to determine the grazing rate of O. niloticus from both toxic and non toxic strains of Microcystis aeruginosa with its effect on fish health through study of some clinical signs, hematological and biochemical parameters.

Enhancement of grazing gastropod populations as a coral reef restoration tool: predation effects and related applied implications

In this study, we aimed to evaluate the efficacy of adding T. niloticus to control epilithic algal biomass and enhance coral recruitment on artificial substrata at a heavily fished reef in northwestern Philippines. Our main hypothesis was that with addition of trochus, the growth of algae would be lower and the number of coral recruits would be higher. The reason for trying to control algal growth through trochus grazing was to reduce preemption of space for settlement of coral larvae.

Development, use and management of the Zhoushan fishing ground, China

The Zhoushan fishing area contains the Zhoushan archipelagos, whose population is nearly 1 million, including over 300,000 fishermen. A detailed account is given of the environment and its resources; there are more than 300 species of fish, over 60 species of shrimp, more than 10 species of crab and more than 50 species of algae in the area. The history of fishery development in the area is described, outlining motorization, technology, and education. Various regulations and management activities, implemented in the 1980s, are highlighted.

Control of microcystis aeruginosa using tannic acid

One of the most difficult challenges facing the commercial fish producers is how to keep the constant balance that required maintaining a stable relationship among the water, fish and microscopic flora and fauna in their pond systems. This study was conducted to determine the effectiveness of tannic acid for controlling the growth of the cyanobacteria (Microsystis aeruginosa) using several doses via indoor experiment. Together with evaluating its safety to fish health and survival.

Harmful algal blooms in Malaysia: occurences and monitoring strategies

With globalisation, importing countries often demand greater transparency together with the need for accredited certification of imported products. Although harmful algal blooms (HABs) do not pose a serious problem in Malaysia, except for Sabah, steps must be taken to develop effective monitoring programmes for harmful algae and HAB toxins. This paper describes the status of HABs in Malaysia and the monitoring programmes implemented to ensure seafood safety. Measures taken to upgrade and improve HAB management are also discussed.

Salinity preference of two diatoms and their growth performance in three prepared and two alternative on-farm media sources

Salinity and preferred nutrient composition of <i>Chaetoceros affinis</i> and <i>Skeletonema costatum</i> were tested. Salinity was tested at 12, 16, 23, 28, and 32 ppt. Three compositions of nitrogen (N), phosphorus (P), and potassium (K) and two on-farm low-cost alternative media sources, cow urine (CU) and hatchery waste water (HWW), were tested to find the suitable NPK ratio and to determine the efficacy of the on-farm media respectively.

Investigating the role of algae in tilapia production

Evidence for the role of algae as food in tilapia production is contradictory and typifies a general uncertainty about the importance of algae-to-fish food pathway in aquaculture. Viewpoints regarding the importance of algae cropping by fish reflect this uncertainty. Some aquaculturists believe that the commonly cultured tilapias harvest algae inefficiently, eating only about 10% of the total net algae production. Others, believing the algal feeding pathway for tilapia to be efficient, recommend its application.

Coral reef fishing and coral-algal phase shifts: implications for global reef status

Coral reef fisheries support tens of millions of people, mostly in developing countries. Fishing on reefs can be classified into three stages: manageable, ecosystem-overfished, and Malthusian-overfished. Fishing with blasting devices and poisons is often associated with the third stage. Reductions in herbivory caused by overfishing may enhance the likelihood of organic pollution causing a coral–algal phase shift following major disturbances. However, cage studies indicate that reduction in herbivory can lead to the proliferation of algae even in the absence of eutrophication.

Biological control of the cyanobaterium Microcystis sp. using Chlorella and Sendessmus in the Nile tilapia culture

This study aimed to investigate the use of Chlorophyta Chlorella elliposoides and Scenedesmus bijuga (Turpin) Lageh as a biological control means against Microcystis aeruginosa Kutz as a laboratory trial before field application. The number of M. aeruginosa was reduced in all treatments. The presence of C. elliposoides and S. bijuga are sufficient enough to inhibit or control the growth of M. aeruginosa and safe for the exposed fish. In comparison to the control, the group treated by 20 x 103 cells mL-1 (D3) of C. elliposoides and S. bijuga induced 100% inhibition to M.

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