Because of the influence of fish egg quality and environmental conditions during hatching, fry can vary in vitality. This variation has a significant impact on their survival and growth. Experienced farmers can assess the quality of fry by observing their color, swimming behavior, and ability to resist stress. Here are the methods for identification:
First, examine the body color. High-quality fry should have a uniform, clean appearance without any white or dead seedlings. When exposed to light, their bodies should appear slightly yellow or slightly red. On the other hand, poor-quality fry often have inconsistent coloring, with visible white spots or dead seeds, and their bodies may look dirty or grayish-black.
Second, observe their swimming behavior. Place the fry in a container of water and gently stir the water to create a vortex. Healthy fry will swim against the current and stay near the edges of the container. In contrast, weak or poor-quality fry tend to be swept into the center of the vortex and struggle to maintain position.
Third, perform a sample test. Place the fry in a white porcelain basin and slowly pour water into it. High-quality fry will actively swim against the water flow and show strong movement when the water is drained. They will struggle in the basin, with their heads and tails bent at a noticeable angle. Poor-quality fry, however, will float passively with the water and show weak movement after drainage. Their heads and tails may only twist slightly, indicating poor health and low viability.
By using these simple yet effective methods, farmers can quickly determine the quality of fry and make informed decisions about which ones to keep for further rearing. This helps ensure better survival rates and more successful fish farming outcomes.
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