Untitled

Abstract

The agarophyte Gracilaria verrucosa (Hudson) Papenfuss was cultivated under greenhouse conditions in Modified Johnson Medium over a 5-month period. Biomass productivity ranged between 5.00 g L -1 to 16.37 g L -1 and the highest biomass was obtained in December. Relative growth rate (RGR) varied from 4.03±1.63 to 1.21±0.34% day -1. While the highest percentages of protein were found in December (20.28±0.94% of dw), the lowest percentages were in March (14.99±0.14% of dw). Phosphorus content ranged from 101.66±3.11 ppm (march) to 114.03±5.44 ppm (december). The lipid concentrations of G. verrucosa were measured within 2.39±0.77% dw and 2.66±0.94% dw. The agar yiel were determined between 9.65±1.12 and 18.64±2.38% of dw in december and march. The melting and gelling temperatures were stable through the experiment. The highest and the lowest values for both melting and gelling temperatures were 39.00±0.35°C (december) -34.00±0.32°C (march) and 86.50±0.30°C (march) -85.50±040°C (february), respectively. As a result of this study G. verrucosa could be cultivated in greenhouse conditions succesfully. Depending on the high growth rates, high concentrations of crude protein, phosphorus and agar of Gracilaria we conclude that it can be cultivated in greenhouse conditions.

A Study on Water Quality Assessment of Özen Spring near Suşehri in Sivas, Turkey

“…Thus, it can be said that Özen Spring water can be used for drinking water supply with advanced or appropriate treatment, recreational purposes and aquaculture outside of rainbow trout. The orto-phosphate values obtained in the present study is normal for aquatic ecosystems within recommended range of 0.05-0.3 mg/L (Cirik and Cirik, 2008). According to Bulut et al, (2011) when phosphate concentration is over that 0.3 mg/L, it means that eutrophication occurs in lake.…”

Phytoplankton Composition and Water Quality of Kamil Abduş Lagoon (Tuzla Lake), Istanbul-Turkey

“…In the present study, chlorophyll-a concentrations were estimated between 0.46 and 349.2 µg/L and the average was 23.59 µg/L. It was expressed that chlorophyll-a concentrations between 5 and 140 µg/L indicates an eutrophic lake [40]. High levels of chlorophyll-a concentration, which shows hypereutrophic conditions, were measured in station 3 in autumn when the maximum concentrations of NO 3 were recorded in the lagoon.…”

<i>Gracilaria Gracilis</i> – A Review of Ecological Knowledge, Chemical Composition, Cultivation, and Applications

“…A study conducted by [Cirik et al, 2010] showed that G. gracilis had a wide salinity tolerance range, and the optimum production was determined at 42‰ salinity. Moreover, [Özen et al, 2018] found that G. gracilis grows well in the salinity ranges between 25‰ and 35‰.…”