Proximate Composition Analysis of Spirulina platensis in Lab Scale Cultivation: Prospects of Digested Rotten Guava as a Culture Media

Abstract

An experiment was conducted to evaluate the proximate composition of Spirulina platensis and growth performance in supernatant of different concentrations (supernatant of 20, 40 and 60 rotten guavas) of digested rotten guava medium (DRGM). The growth rates in terms of optical density, dry cell weight and chlorophyll a of spirulina were varied from each other. The cell weight of Spirulina was attained a maximum of 0.818 ± 0.003 mg/L in 60% DRGM followed by 0.815 ± 0.0015 and 0.809± 0.0012 mg/L in supernatant of 20 and 40%, respectively on the 10th day of culture. Similar trend was also observed in the case of optical density of the media contained Spirulina, chlorophyll a content (mg/L), total biomass (mg/L), specific growth rates (on the basis of cell weight and chlorophyll a) and total biomass of Spirulina. Cell weight of Spirulina grown in these media had highly significant (P < 0.01) correlation with the chlorophyll a content (r = 0.746) and total biomass (r = 0.742) of Spirulina. The growth performance of Spirulina in supernatant of 60% DRGM was significantly (P < 0.01) higher than that of grown in 20% and 40% DRGM. The percentage of crude protein was found 53.35 ± 0.32% in supernatant of 40% DRGM. The crude lipid was attained of 10.15 ± 0.14% in supernatant of 60% DRGM which was significantly (P < 0.05) higher than that of grown in 20% and 40% of DGRM.

Multifaceted Linkages among Eco-Climatic Factors, Plankton Abundance, and Gonadal Maturation of Hilsa Shad, Tenualosa ilisha, Populations in Bangladesh

“…The reproductive physiology of hilsa fish in the rivers of Bangladesh is influenced by various environmental factors, such as air temperature, relative humidity, rainfall, wind speed, dissolved oxygen, pH, salinity, and plankton abundance [119][120][121][122]. These factors may impact the growth, feeding, and reproductive behavior of hilsa fish, and understanding their relationships is crucial for developing sustainable fishery management strategies [6,20,123,124]. Temperature, humidity, rainfall, and wind speed may affect water chemistry and oxygen levels.…”

“…This correlation suggests that the availability of phytoplankton plays a crucial role in providing the necessary nutrients and energy resources for the reproductive processes of Hilsa fish. Phytoplankton, as the primary producer in aquatic ecosystems, serves as a fundamental food source for many zooplankton species, which are in turn consumed by Hilsa fish [124]. The abundance of phytoplankton in the water column directly or indirectly affects the nutritional status of Hilsa fish and subsequently influences their reproductive activities.…”