About Jellyfish

About Jellyfish


  • 1 Introduction to jellyfish
  • 2 Interesting Facts About Jellyfish
    • 2.1 Jellyfish reproduce by laying eggs
    • 2.2 A species of jellyfish has 24 eyes
    • 2.3 Jellyfish have a large number of stinging cells
    • 2.4 The sea wasp is one of the most dangerous animals
    • 2.5 Jellyfish can group together when water is polluted
  • 3 Structure of the body of a jellyfish.
  • 4 life cycle of jellyfish
  • 5 foods jellyfish eat
  • 6 Some types of jellyfish
  • 7 jellyfish sting
  • 8 references

  • Related
  • Jellyfish sting damage
  • Benefits of a jellyfish sting

 Introduction to jellyfish 

jellyfish Scientific name: Scyphozoa) to which the jellyfish belongs. Its name comes from the Greek word (skyphos), which denotes a cup intended for drinking. [1]

 Interesting information about jellyfish 

We explain some interesting information about jellyfish as follows:

Jellyfish reproduce with eggs.

The female jellyfish lays her eggs in the water where she is fertilized, then the eggs hatch into a larva called planula; It attaches itself to a hard surface which can be the bottom of the sea, a rock, or even the body of a fish, and the larva grows to form a polyp, and the jellyfish continues in the polyp stage for months or years, after which it separates from the fixed floor, and begins to move, completing its life stages as a young jellyfish (English: Ephyra), then as an adult jellyfish. [2]

One species of jellyfish has 24 eyes.

A species of jellyfish known as a cube jellyfish has 24 true eyes. Each eye consists of a lens, a network, and a cornea. These eyes are arranged in pairs that surround the body of the jellyfish; So one eye looks up while the second looks down, allowing the jellyfish to have a 360 ° viewing angle, making this the most advanced visual system in the animal kingdom. and avoid predators. [2]

Jellyfish have a large number of stinging cells.

Jellyfish have thousands of stinging cells, at the ends of which are thousands of filamentous sacs that carry a toxic substance. The sea manages to sting even after his death. [2]

The sea wasp is one of the most dangerous animals.

The sea wasp (Chironex fleckeri), one of the largest species of bucket jellyfish, is one of the most dangerous animals on Earth, and may even be the most dangerous; Its bell is the size of a basketball and its tentacles are up to three meters long. The sea wasp, which roams the waters of Australia and Southeast Asia, has killed at least 60 people over the past century. [2]

Japanese scientists have discovered a jellyfish known scientifically as (Turritopsis dornii), with amazing abilities that make it a living and immortal creature, at least in the laboratory, since this type of jellyfish, after reaching adulthood, is capable to return to the immature stage. again, and so on to infinity. [2]

Jellyfish can clump together when water is polluted

jellyfish can flourish; Any meeting in numbers that can reach hundreds or thousands, and this meeting is an indicator of ocean water pollution, or the occurrence of global warming, and this phenomenon occurs in warm waters or in waters without oxygen. [1]

 Body composition of jellyfish 

يتكون جسم قنديل البحر بشكل أساسي من الماء الذي يشكل 98% من جسمه, وهو بسيط التركيب ولا يحتوي على قلب, أو عظام, أو دماغ, ولكنه يحتوي على أعصاب حسية بدائية في قاعدة اللوامس تمكنه من تمييز الروائح, ورؤية الضوء, وتحديد اتجاهه, وبشكل عام يتكوّن جسم قنديل البحر من الأقسام الآتية: [٣]

  • البشرة: (بالإنجليزيّة: Epidermis) وهي الطّبقة الخارجيّة التي تحمي الأعضاء الدّاخليّة.
  • الأَدَمَةُ المَعِدِيَّة: (بالإنجليزيّة: Gastrodermis) وهي الطّبقة الدّاخليّة.
  • الهلام المتوسط: (بالإنجليزيّة: Mesoglea) وهو مادة هلاميّة القوام تقع بين البشرة والأدمة المعديّة.
  • الجَوفُ البَطْنِيُّ الوِعائِيّ: (بالإنجليزيّة: gastrovascular cavity) وهو تركيب يؤدي وظيفة كل من المريء ، والمعدة ، والأمعاء.
  •  The hole: (Spanish: Orifice) It works as a mouth and anus at the same time. 
    •  The tentacles: (English: tentacles), which are structures that surround the edges of the body of the jellyfish. 

 jellyfish life cycle 

We explain the life cycle of a jellyfish as follows: [4]

  • An adult male jellyfish releases sperm from its mouth.
  • Some types of female jellyfish lay their eggs in their arms, then these eggs are fertilized by sperm while swimming, while other types keep the eggs in their mouths, then swallow the sperm that reach the stomach for fertilization, and then the fertilization the eggs are released. to hold onto the female's arms.
  • The eggs begin to hatch, then the larvae emerge and float to the surface of the water, and if they survive from predators, after several days they anchor on the seabed and become a polyp, a cylindrical structure that resembles a leg.
  • The larvae adhere to any solid object and begin to form new polyps from their stem, and after several years the larvae move to a new stage of development.
  • In the last stage, the organisms begin to form horizontal furrows (polyps), which quickly turn into small jellyfish.

 Foods that jellyfish eat 

Jellyfish are carnivores. Small jellyfish feed on microorganisms that float on the surface of the sea, such as small fish, fish eggs, and plants, while large jellyfish feed on larger organisms, such as shrimp, crabs, plants, and crabs, in addition to other jellyfish. . In its environment, and although the jellyfish has a simplified digestive system, it is capable of ingesting different types of food. [5]

 Some types of jellyfish 

There are different types of jellyfish, [6] we mention some of them as follows: [7]

  • Lion's mane jellyfish.
  • Ordinary jellyfish or moon jellyfish.
  • Medusa Irukandji.
  • Cube Jellyfish (in English: Box Jellyfish).
  • Portuguese warship jellyfish.
  • Medusa (English: Sea Nettle).

 Jellyfish sting 

Many swimmers and divers are exposed to stings from jellyfish that inject venom into their bodies, and show symptoms that vary in severity depending on several factors, including: the type and size of the jellyfish, the age of the victim, the time it spent was stung, and the amount of skin damaged. [7]

Common symptoms of jellyfish ability: severe pain and burning, red or brown or purple markings as a result of skin contact with the tentacles, itching and swelling, and severe symptoms that may appear when exposed to jellyfish ability, they should see a doctor as soon as they occur, include both: [7]

  • stomach ache.
  • Headache.
  • Muscle aches or spasms.
  • Nausea vomiting
  • Feeling weak and confused
  • drowsiness, loss of consciousness
  • difficulty breathing
  • Heart problems

Treatment for a jellyfish sting includes first aid, including: rinsing the affected area with vinegar, carefully removing the tentacles from the skin with tweezers, and immersing the skin in hot water at a temperature of 43 to 45 degrees Celsius for 20 45 minutes. Regarding the medical treatment of a jellyfish sting, it includes: [8]

  • Cardiopulmonary resuscitation (CPR) if the patient had a severe allergic reaction to a jellyfish sting.
  • Give antitoxins to the victim, if stung by a cube jellyfish.
  • In the event of a skin rash or tenderness, antihistamines or corticosteroids can be given to the patient and oral pain relievers can be given.
  • Receive immediate medical attention if the injury is in or near the eye; To clean it and reduce pain, it is preferable to go to a specialized ophthalmologist, due to the sensitivity of this area.

 The jellyfish is an invertebrate marine animal that protects itself from stings and includes several species such as the common jellyfish, lion's mane, bucket, and sea nettle. The female fertilizes her eggs and, after several days, they hatch into larvae that turn into tiny jellyfish, and the jellyfish feed on living organisms as a class of carnivores. 

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