What food do farmed turbot eat?
Turbot is a valuable flatfish native to the coastal waters of Europe. In fish taxonomy it belongs to the class Osteichthyes, order Pleuronectiformes, suborder Pleuronectoidei, family Scophthalmidae, genus Scophthalmus (Psetta). It is a carnivorous fish that inhabits the sandy seabed of shallow seas and feeds mainly on benthic invertebrates and other fish. Let us now take a look at what food turbot eat!
What food do turbot eat?
In natural sea areas, turbot has the ability to ambush prey. The larvae feed mainly on crustaceans, and as the fish continues to grow it gradually feeds on various fish. Its usual prey includes spotted mullet, striped mullet, white mullet and grass shrimp. In intensive farming it is easily trained to eat compound feed (for example: extruded fish feed, etc.).
The growing environment of turbot
1. Temperature: The survival water temperature for adult fish is 2-36°C, the suitable growing temperature is 16-32°C, and the optimal growing water temperature is 21-26°C. The water temperature during the fry-rearing period is generally 16-20°C (Guangdong is suitable for farming all year round).
2. Salinity: The optimal salinity during the fry-rearing period is 18-30‰. From the juvenile stage after metamorphosis to the adult stage, the tolerance to salinity is very wide, and the fish can grow normally within the range of 0-30‰.
3. Light: Turbot is a benthic fish, so the light should not be too strong; 500-1500 lux is suitable. The light should be even, soft, not dazzling, and comfortable to the eye. The light rhythm should be the same as natural light.
4. Water quality: The water should be clear and meet the national Class II fishery water quality standard. The pH of the water body should be higher than 7.3, preferably maintained between 7.6-8.2, and dissolved oxygen should be greater than 6 mg per liter.
Feed selection for turbot
1. Meet nutritional needs: The feed used for turbot farming should suit the nutritional needs of different growth stages, containing an appropriate amount of various vitamins, minerals and highly unsaturated fatty acids, etc. The feed used should be easy to feed, with well-formed pellets that do not easily disintegrate in water.
2. Choose reputable suppliers: When purchasing feed, check whether the feed label states the following: it should be marked with the words “This product conforms to feed hygiene standards” to clearly indicate that the product complies with the provisions of GB13078. It should state the guaranteed values of the main components, namely the content of crude protein, crude fiber, crude ash, calcium, total phosphorus, salt, moisture, amino acids, etc. It should state the standard number implemented for the production of the product, the production license and the product approval number. Specifications, model, net weight, production date, shelf life, name and address of the producer, etc.
2. Prohibit wet feed: To eliminate pathogenic organisms being brought into the fish pond from the feed, it is recommended that wet pellet feed be prohibited in industrial farming.
4. Selection of fresh feed: Sand lance, sardine, jack mackerel, chub mackerel and other fresh miscellaneous marine fish are the main raw materials for making turbot feed. Fresh miscellaneous fish generally account for 50% of the feed or slightly more. The fresh miscellaneous fish must be fresh and washed before processing. Miscellaneous fish that have already spoiled or have an off odor must never be used.