Productivity ofSargassum linearifoliumin potassium fortified inland saline water under laboratory conditions

Abstract

Growing aquatic species in inland saline water (ISW) is one way to reduce the adverse impact of ISW to agriculture farms. This 84‐day laboratory‐trial was conducted to study the growth of Sargassum linearifolium cultured in ocean water (OW), ISW, ISW fortified with potassium equivalent to 100% (ISW100), 66% (ISW66) and 33% (ISW33) of potassium in OW at 35 g/L. The biomass and cumulative specific growth rate (SGR) of S. linearifolium increased significantly (p < .05) with increased potassium in ISW until 56 days and then declined. The ISW100 and OW resulted in similar growth patterns and yielded peak biomass at day 42, proving static biomass for the next 28 days before declining. The biomass of S. linearifolium cultured in ISW and ISW33 significantly (p < .05) decreased and was lower than in ISW100 and died after day 56. The SGR of S. linearifolium in OW, ISW100 and ISW66 levelled off and showed no difference during the first 56 days. The S. linearifolium biomass and SGR negatively and significantly (p < .05) correlated with the concentrations of nitrate, phosphate in all waters. The increased potassium concentration in ISW similar to its concentration in SW brought the growth of S. linearifolium cultured to a level that was similar in OW.

Effects of Temperature and pH on the Growth of Sargassum linearifolium and S. podacanthum in Potassium-Fortified Inland Saline Water

“…The SGR of S. linearifolium in the ambient pH and ambient temperature of this study was much lower than S. linearifolium (Bui et al, 2017b), although the environmental conditions and growing season (during different years) were similar showing the different growth feasibility of whole thalli (this study) and small piece (Bui et al, 2017b).…”

“…The K + deficiency is in common in Australia and USA (Ingram et al, 2002;Boyd and Thunjai, 2003) although the ionic profile of ISW can be similar to OW at the same salinity ). Therefore, ISW should be fortified with K + at similar or about 33-66% of the K + concentration in OW at the same salinity for proper growth of S. linearifolium and Lomentaria sp., respectively (Bui et al, 2017a;2017b). The K + plays a major role in the growth of algae and cannot be substituted by any other ion (Yarish et al, 1980).…”

“…It is not feasible for marine shrimp, fish and mollucs to survive and grow without K + fortification, similar to K + levels to OW (Fielder and Allan, 2003;Doroudi et al, 2006;Prangnell and Fotedar, 2006b;Dinh, 2016). The S. linearifolium also needs K + -fortified at similar K + concentration in OW to sustain its growth in ISW (Bui et al, 2017b). In southwest WA, while the pH of OW is stable from 7.8-8.2, salinity from 35.5-36.5 (Hoang et al, 2016) and temperature of 22.0-32.0°C (Martin-Smith, 1993), the pH, salinity and temperature of ISW in the wheat belt of WA are generally varied by the depth and location of the groundwater (Nurmi et al, 1988;Nulsen, 1997;Taukulis and John, 2009).…”

Dietary lipid requirement of juvenile white‐leg shrimp, Penaeus vannamei (Boone, 1931) reared in inland ground saline water of 15 ppt

“…More than 385 million hectares of land are salt‐affected and are expected to rise by 50% by 2050 (Jamil et al, 2011; Partridge et al, 2008). These vast natural resources are not suitable for agricultural activities (Bui et al, 2017). Exploring the degraded soils and under‐utilized inland ground saline water (IGSW, salinity 3–25 ppt in India) for aquaculture practices can provide employment opportunities and livelihood generation through enhanced fish and shrimp production (Talukdar et al, 2021).…”