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The study aimed to assess the impact of stocking density on the growth performance, survival rate and production of seabass (Lates calcarifer) fingerlings in floating net cages conducted at the Maheshkhali Channel, Cox's Bazar, Bangladesh. A triplicate group of seabass, with an average initial weight of 86.82 ± 1.9 g, was randomly stocked in floating net cages at densities of 15, 12, 10 and 8 fish m−3, referred to as T15, T12, T10 and T8, respectively. The fish fingerlings were supplied with freshly chopped sardine (Sardinella fimbriata) at 10% of their body weight for 4 months and 5% for 2 months, administered twice daily. The water quality metrics were measured fortnightly. The initial and the final proximate composition of seabass was not significantly different (p > 0.05). Upon completion of the experiment on the 180th day, the growth performance and additional measures, including final body weight, weight gain (WG), percent weight gain (PWG), specific growth rate (SGR), feed conversion ratio (FCR), feed efficiency ratio (FER), survival rate and total production, were assessed. Comparisons of growth and yield demonstrated that fish stocking density significantly (p < 0.05) influenced growth and productivity. Fish cultivated at maximum density (T15) exhibited lower mean weights than those raised at lower densities. This study demonstrated that T10 had better results for all growth and other metrics examined, indicating the appropriateness of this density. Therefore, it may be inferred that seabass exhibits optimal growth at a stocking density of 10 fish m−3 along the coast of Cox's Bazar, Bangladesh. [ABSTRACT FROM AUTHOR]

The present study aimed to develop a suitable method for the production of good quality shidol at the Floodplain Substation, Bangladesh Fisheries Research Institute (BFRI), Santahar, Bogura, Bangladesh. For this purpose, an improved quality shidol was prepared following scientific methods by BFRI, while traditional shidol was collected from Rangpur, Kurigram, Dinajpur, Lalmonirhat, Bogura, Nilphamary, Syedpur region. In the present study, proximate composition, biochemical and microbiological analysis of the BFRI made shidol and the traditional shidol were carried out during the 90 days of storage period after vacuum packaging. In proximate composition analysis, higher level of protein and fat content were found in BFRI made shidol than the traditional shidol. However, the traditional shidol samples showed poor quality due to the high total volatile base nitrogen (TVB-N), peroxide values, and moisture along with a promising microbial load; in contrast, the results obtained in the BFRI shidol samples were within the acceptable limit for human consumption. The presence of coliform bacteria in the traditional shidol also reflected the improper handling, unawareness of good hygiene and sanitation during production. The results of this study indicate that vacuum packaging can be an effective method in maintaining the quality of shidol by preventing crosscontamination and delaying the degradation of nutrients. Additionally, an improved BFRI technology for shidol production can minimize the biochemical and microbiological quality loss of shidol. [ABSTRACT FROM AUTHOR]