Every time dozens of tons of seafood are scraped from the bottom of the ship and sold to the seafood market. Is this seafood edible?

When I was traveling, I passed a ship repair shop and saw many workers scraping the bottom of the ship with tools. I was curious at the time. Isn't the boat in the water? Why do you need to send it ashore for cleaning? What are these scraped things? Later, I learned that the ship has been sailing in the sea for a long time, and many marine life will be attached to the bottom of the ship, which needs to be cleaned regularly.

Sailors often joke: "The bottom of the boat crossing the sea is like a large free seafood market, with rich varieties and random choices." So, can these seafood scraped from the bottom of the boat really be eaten?

Some marine creatures like to attach themselves to other objects, and the huge bottom floating in the sea has become their ideal place. Animals, plants and microorganisms, such as diatoms, barnacles, oysters and mussels, attached to the bottom of the ship and various parts and equipment on the ship can be found at the bottom of the ship.

Barnacles and shells are the most abundant. These marine life will not only adhere to the bottom of the ship, but also to the reefs in shallow waters and their large marine animals, such as whales and turtles.

The longer a ship sails at sea, the more "seafood" will be attached to the bottom of the ship. When returning with the voyage ship, there are countless seafood attached to the bottom of the ship. The cleaning machine can clean dozens of tons of seafood once cleaning the bottom of the ship. It stands to reason that these seafood can be sold completely. After all, seafood is not cheap, and dozens of tons of seafood will be a big income. However, no one will take the seafood at the bottom of the ship to the market to buy, and no vendor is willing to buy it. Why? Can't the seafood scraped from the bottom of the boat be eaten?

Ships need to consume fuel when sailing at sea. Generally speaking, the fuel of a ship is oil. We know that oil will inevitably produce some substances harmful to human body during the combustion process, which will be discharged into seawater and used by marine organisms such as barnacles and mussels attached to the bottom of ships. These harmful substances will enter their bodies. If you eat these seafood, it will inevitably cause harm to the human body.

Not only that, sometimes when a ship is sailing, some domestic sewage on board will be directly discharged into the sea. Domestic sewage is the favorite of these attached organisms, and nutrients will be fully absorbed by them, even helping them to reproduce faster. The substances in sewage are good for them, but not for humans. These marine life will inevitably absorb some harmful substances.

Since sailing at sea, people have encountered marine life that will parasitize the bottom of the ship. Because these parasites can affect the navigation of ships, people have been looking for solutions. At first, people thought of coating some toxic coatings on the bottom of the ship, which could not only slow down the rust on the bottom of the ship, but also defend against parasitic organisms. Because toxic paint may pollute seawater, people no longer use toxic paint, but even so, seafood attached to the bottom of the ship will absorb harmful substances.

So it's best not to eat seafood cleaned from the bottom of the boat. If you eat goose seafood containing harmful substances, it is gastrointestinal discomfort and poisoning. Go directly to the hospital.

Seafood scraped from the bottom of the ship cannot be sold or eaten. Cleaning the bottom of the ship requires not only manpower, but also a lot of special equipment. This seems to be a loss-making business. Why should the ship be cleaned regularly?

In fact, these marine organisms parasitize the bottom of the ship, which will not only affect the normal operation of the ship, but also cause damage to the hull, resulting in a greatly shortened service life of the ship.

Some cargo ships and cruise ships need to travel at sea for a long time, and marine life living in shallow waters will continue to take the opportunity to stick to the bottom of the ship. Slowly, with the passage of time, there will be more and more marine life attached to the bottom of the ship. A barnacle is not heavy, but thousands of barnacles attached to the bottom of the ship may make the already heavy ship even more overwhelmed. If these attached marine organisms are not cleaned up in time, the ship's load will be greatly increased, resulting in an increase in fuel consumption, which will not affect normal driving and will also cause economic losses.

Once a crew member took his own ship as a representative and calculated that the weight of a cruise ship full of goods was about 300,000 tons. Excluding the influence of wind and other factors, the average fuel consumption of a ship is about 500 thousand tons a day, that's all. If the ship runs on the sea for a long time, there will be more and more marine life attached to the bottom of the ship, which will lead to the increasing total weight of the ship and the increasing fuel consumption.

In contrast, if the organisms attached to the bottom of the ship are not cleaned up all the time, the average daily fuel consumption of this ship will increase by about 20 tons in five years, and the fuel resources wasted over time will be an amazing number. But after cleaning, you can save about five tons of fuel consumption every day. So it is very necessary to clean the bottom of the ship regularly.

Creatures attached to the bottom of the ship can also cause damage to the hull. Some shellfish attached to the bottom of the ship will secrete some acidic substances. With the continuous accumulation of acidic substances, it is likely to corrode the bottom of the ship and affect the service life of the ship. Once these plankton are attached to the propeller, the resistance of the propeller increases, which may cause the ship to slow down under the condition of constant power. If these creatures cause damage to the parts on some ships, the consequences will be unimaginable, which greatly increases the safety hazards during navigation. Therefore, it is essential to clean the bottom of the ship regularly.

How to clean up these plankton? Some boats still brush the bottom. Although this method can inhibit the growth of plankton in a short time, if it is immersed in water for a long time, the efficacy of toxic substances in the bottom of the ship will gradually fade, and the ideal effect will not be achieved, and the water quality will be greatly polluted.

With the development of technology, besides manual cleaning, there are many methods to clean the bottom of the ship. One of them is to clean the bottom of the boat by spraying a special cleaner, just like spraying a layer of foam cleaner when washing the car, which can easily and efficiently clean these seafood, but it will also cause damage to the boat, so it is not used much.

The second method is to remove it by friction with quartz sand. Although this method is very effective, it is difficult to operate and the cost is relatively high. Another method, which is also the most widely used method at present, is to clean the bottom of the ship with a special water gun. By controlling the flow rate and pressure, when the water flows through the cavitation nozzle of the water gun, the small bubbles generated are used to achieve the cleaning effect. This method is not only environmentally friendly and safe, but also will not cause damage to the bottom of the ship.

The bottom of the ship is thoroughly cleaned regularly. In order to reduce the loss, some shipowners usually paint their ships, and then make up after the paint falls off. Now there is a special paint for ships, which can not only reduce the attachment of marine life, but also play a role in sun protection, rust prevention and high temperature resistance. Besides painting, I also do some daily cleaning and care.

Because the seafood at the bottom of the ship is inedible, the disposal method after cleaning is also very important and needs to be very careful. The general disposal method is to clean the seafood, take it away by a special car, and then crush it directly, dig a pit and bury it to prevent people from picking it up and eating it by mistake, which will cause life danger.