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Growth and absorption response of Eucheuma denticulatum(Burman) Collins & Hervey) to fish farm water quality condition


Abstract

Two sampling sites (573m apart) were selected, one serves as the experimental site with floating cages for milkfish and pompano located near the coast, and the other representing the control site also with floating cages containing the same fish species located in a deeper area of the bay. Biomass and growth rates of E. denticulatum was measured on a monthly interval, along with physico-chemical parameters in the two sites, monitored for a period of up to one year. Results showed that seaweed species grew well within the conditions of the experimental fish farming site, where water temperature, salinity, pH, dissolved oxygen were found to be well within the optimal range. Growth, aside from the seasonal changes in the weather pattern that influenced water movement, was affected by the presence of epiphytes, predators and fouling organisms that were present during culture. These factors have reduced potential biomass, nutrient absorption, and growth rates of the seaweeds. The introduction of the extractive species in the fish farm appeared to have checked the adverse effects of fish culture activities whose daily inputs of commercial feeds, aside from feces and metabolic wastes, could be the main contributor to the suspended solids in the surrounding waters. The levels of ammonia at 0.5 m (average: 0.047mg/L) in the experimental site was observed to be lower than that of the control site, whereas the levels of nitrate (ave: 0.226mg/L) and phosphate (ave: 0.149mg/L) in the same depth remained relatively high suggesting that these nutrients were not absorbed much.

Keywords

commercial fish culture, IMTA,eucheuma denticulatum,chanoschanos, trachinotusblochii, integrated mariculture systems, finfish monoculture

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