Watermelon rind is rich in essential nutrients that can benefit fish. It contains sugars, crude protein, crude fat, crude fiber, and chlorophyll, along with important vitamins such as carotene, thiamine, riboflavin, niacin, and ascorbic acid. Additionally, it provides minerals like calcium, phosphorus, and iron, which are crucial for fish growth and development. These nutrients make watermelon rind a valuable resource in aquaculture.
Experts suggest that using watermelon seeds as fish feed offers excellent palatability, as fish tend to enjoy the taste and easily digest the material. This not only supports healthy fish growth but also enhances overall fish health. When it comes to using the rind, it serves as an effective and cost-efficient feed option. Incorporating watermelon rind into fish diets can reduce feed costs by 15% to 20%, while also minimizing environmental impact by repurposing what would otherwise be agricultural waste.
Since watermelons are typically harvested between July and August, their availability is seasonal. Direct use of fresh watermelon during this time is limited, making proper storage essential for maximizing its value throughout the year. Storing watermelon rind allows farmers to utilize it effectively for feeding fish during off-peak seasons.
There are two common methods for using watermelon rind as fish feed: fresh and dried.
The first method involves processing fresh watermelon rind with a blender or similar tool and then distributing it directly into the pond. This approach is ideal for species such as larvae, grasshoppers, grass carp, and carp. A typical daily amount is around 80-100 kg per mu of water, depending on the water quality. Alternatively, about 60-80 kg of watermelon rind per thousand fish can be used. This method not only provides direct nutrition to the fish but also helps improve water quality by promoting the growth of natural food sources. For best results, the rind should be finely chopped to ensure it is easily consumed by the fish.
The second method involves drying the watermelon rind using a planer or dehydrator, then grinding it into a fine powder. This powder can be mixed with other feeds and applied at a rate of 2-3 kg per mu of fish pond, three times a day. Combining it with other feed sources enhances its effectiveness and ensures a balanced diet for the fish.
By utilizing watermelon rind as fish feed, farmers can achieve both nutritional and economic benefits. It’s a sustainable practice that supports fish health, reduces feed costs, and promotes environmental responsibility. With proper preparation and application, watermelon rind can become an integral part of a well-rounded aquaculture system.
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