Sustainable Polychaete Aquaculture: Effects of Spirulina on Growth and Nutrient Composition of Perinereis Nuntia

• Ifthekher Ahmed Shakib ^[1] ; Saifuddin Rana ^[1] ; Zobair Alam Sunny ^[1] ; Mohammad Shakil Khan ^[1] ; Md. Tanvir Hossain Tushar ^[1] ; Md Tarek ^[1] ; Inkiad Ahmed Himel ^[1] ; Sk. Ahmad Al Nahid ^[1] ; Ruhol Amin ^[2] ; Sujan Barua ^[2] ; Shahida Arfine Shimul ^[1]
  1. [1] Department of Fisheries Resource Management, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Khulshi
  2. [2] Niribili Fisheries Limited, Cox’s Bazar, Bangladesh
• Localización: Thalassas: An international journal of marine sciences, ISSN 0212-5919, Vol. 42, Nº. 1, 2026
• Idioma: inglés
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• Resumen

  • This study evaluated the impact of different levels of spirulina (Arthrospira platensis) supplementation - T0 (0%), T1 (2.5%), T2 (5%), T3 (7.5%), and T4 (10%) - included as a percentage of the total feed composition, on the growth performance, feed utilization, survivability, and nutritional composition of Perinereis nuntia over a 50-day trial. Experimental groups were cultured under controlled conditions and provided diets containing different spirulina concentrations. Among the treatments, T3 achieved the highest mean final weight (0.8060 ± 0.1315 g) and weight gain (0.5474 ± 0.1327 g), which was significantly higher than the control and other groups. T2 also showed improved weight gain (0.3703 ± 0.1702 g), corresponding to a 73.8% increase compared with the control, though differences were not significant. Length gain did not differ significantly among treatments, suggesting that spirulina supplementation primarily enhanced biomass accumulation (measured on a wet-weight basis) rather than linear growth. Polychaetes showed negative allometric development, with weight growing faster than length (b = 0.391). Growth indices including specific growth rate (SGR), relative growth rate (RGR), and average daily gain (ADG) were also highest in T3 (SGR: 2.16709 ± 0.3657), with polynomial regression confirming T3 as the optimal supplementation level. Feed conversion ratio (FCR) and feed conversion efficiency (FCE) showed no significant differences (p > 0.05). Survivability was highest in T3, though differences across treatments were not statistically significant. Nutritional analysis of Perinereis nuntia after the feeding trial showed an increase in crude protein (45.63 ± 0.38% to 50.41 ± 0.39%) and crude fat (12.59 ± 0.18% to 14.29 ± 0.18%) with increasing spirulina supplementation in the diet. Overall, spirulina supplementation, particularly at T3, significantly enhanced the growth and nutritional profile of P. nuntia without negative effects on feed efficiency or survival. These findings highlighted spirulina as a sustainable and effective feed additive that can improve polychaete quality for aquaculture industries