Providing good fish feed in tilapia cultivation is essential for growth performance, feed conversion efficiency, fish health, and profitability. Good feed strategy covers feed composition, pellet quality, feeding rate and schedule, feed management practices, and monitoring. Below are key principles and actionable steps to provide high-quality feed for tilapia. tilapia (depositphotos.com) Feed formulation and nutrient composition Protein: Tilapia require diets with appropriate protein levels depending on life stage. Fry and fingerlings need higher protein (32–45%), grow-out tilapia typically need 25–35% protein. Use digestible protein sources such as fishmeal, soybean meal, and other plant or insect proteins balanced by amino acid profile. Energy: Provide sufficient energy (carbohydrates and lipids) to spare protein for growth. Lipids (4–8%) supply energy and essential fatty acids; vegetable oils are common. Amino acids: Ensure limiting amino acids (lysine, methionine) are present; supp...
Amur Bitterling ( Rhodeus sericeus ) habitat The Amur Bitterling is a small freshwater cyprinid native to East Asia, including the Amur River basin, Korea, and parts of China and Japan. It prefers slow-moving or still waters with abundant aquatic vegetation and a soft substrate. Typical habitats include shallow ponds, oxbow lakes, marshes, slow-flowing streams, and the vegetated margins of rivers. Amur Bitterling ( depositphotos.com) Key habitat features: Water flow: Low current or still water reduces egg and juvenile displacement. They avoid fast-flowing channels. Vegetation: Dense submerged and marginal plants (e.g., waterweeds, pondweeds) provide cover, feeding grounds, and sites for spawning activity. Substrate: Soft mud or silt with leaf litter supports invertebrate prey and offers shelter for young fish. Water quality: They tolerate a range of temperatures but favor temperate conditions (roughly 10–25°C). They can endure moderate turbidity and variable dissolved oxygen but do bes...