Drug-induced seedlings: Repeated administration of antibiotics like terramycin during artificial breeding can lead to abnormal development in crabs. The crabs may undergo metamorphosis into the crab stage, but their bodies fail to absorb calcium properly, resulting in soft shells that do not harden. These weak crabs often gather at the edges of the pond and die in large numbers due to their inability to survive.
Shell seedlings: Some crabs may have already transitioned into the early crab stage, making them unsuitable for sale. If such seedlings are sold, they tend to die in large numbers during transportation due to their fragile condition.
Apparel seedlings: This refers to seedlings that vary greatly in size and depth. If they are naturally occurring, they may be mixed with other crab species, leading to inconsistencies. If they are artificially bred, the growth is uneven, and the crabs may fight each other inside the clam shell, causing high mortality.
Seawater seedlings: If the seedlings are not fully desalted, they appear dark and black. When directly moved to fresh water, both natural and artificial seedlings may become inactive or even die, as their bodies are not adapted to the sudden change in salinity.
Seedlings for sale: Some nurseries may fail to sell their crabs quickly, forcing them to keep the seedlings in low-temperature ponds for extended periods. During this time, harmful bacteria and protozoa can enter the crabs’ bodies. Once transferred to warmer environments, the crabs may suffer from shell disease, with some dying due to respiratory failure or dehydration.
Young seedlings: These crabs are transparent with a black line across their cephalothorax. They are very young and have soft shells, which make them highly vulnerable to handling and transport stress.
High-temperature seedlings: In some artificial nurseries, water temperatures are raised to speed up development and reduce costs. However, this practice leads to weaker crabs that struggle to adapt to cooler conditions, resulting in lower survival rates during the critical incubation phase.
By understanding these different types of seedlings, breeders can better assess the quality of their stock and improve overall survival rates in aquaculture operations.
In terms of design, pellet ovens usually use advanced temperature control systems and automatic feeding mechanisms, which can accurately control the cooking temperature, and continuously and stably supply fuel without manual frequent addition, greatly simplifying the operation process and improving the convenience of cooking. Its wide grill net and adjustable grill design make it easy to handle barbecue, grilled fish, grilled vegetables, baked bread, pizza and other delicacies to meet different tastes and cooking needs.
In addition, the pellet oven also has the characteristics of rapid preheating, which can reach the ideal cooking temperature in a short time, shorten the waiting time and improve the cooking efficiency. At the same time, its well-sealed furnace body design helps to lock the original flavor of food, so that the baked food is burnt outside and tender inside, and the taste is excellent.
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