What are sharks? Sharks are a group of elasmobranch cartilaginous fish
characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits
on each side, and pectoral fins that are not fused to the head. Modern sharks are
classified within the division Selachii (or Selachimorpha) and are the
sister group to the Batoidea (rays and skates).
CHARACTERISTICS OF SHARKS
Cartilaginous Skeleton: Unlike bony fish, sharks have a skeleton made of cartilage, which is lighter and more flexible than bone. This gives them enhanced maneuverability in water.
Dermal Denticles (Placoid Scales): Their skin is covered in tiny, tooth-like structures called dermal denticles, which reduce drag and turbulence, allowing them to swim efficiently.
Gill Slits: Sharks typically have five to seven pairs of gill slits on the sides of their heads, which they use for breathing.
Pectoral Fins: Sharks have paired pectoral fins that are not fused to the head, which they use for steering and lift in the water.
No Swim Bladder: Instead of a swim bladder (like bony fish), sharks rely on a large, oil-filled liver to maintain buoyancy.
Electroreception: Sharks possess special sensory organs called ampullae of Lorenzini, which allow them to detect the electric fields produced by other animals—useful for hunting.
✮ Misconceptions about Sharks ✮
Myth: Sharks are hungry man-eaters looking for any chance to attack.
This is not true. Most shark “attacks” are accidental, often due to poor water visibility or are simply inquisitive bites. That’s why there are far more bites than fatalities. Stories of sharks wrecking ships and boats are similar—sharks don’t realize there’s a vessel above them.
Myth: All sharks are voracious predators.
Not true. Two of the largest sharks in the world—the basking shark and the whale shark—are filter feeders and only consume small organisms.
Myth: Sharks have no predators.
False. The greatest threat to sharks is humans, who hunt them for their fins and other body parts. So there. :D
✮ Different Types of Sharks ✮
Here are a few of my favorite sharks and facts about them. Hate them and I'll hate you. :D
⋆˙✮WHALE SHARKS✮⋆˙
TYPE: Fish - Shark
LITTER SIZE: Up to 300 pups
OTHER COMMON NAMES: Rhincodon typus
LIFE SPAN: 70–100 years
DIET DESCRIPTION: Plankton, small fish, and crustaceans
MAX LENGTH: 40 feet (12 meters)
HABITAT AND RANGE: Found in tropical oceans worldwide, whale sharks are often found near coastal areas where food is abundant.
IUCN STATUS: Endangered (EN) - Decreasing population
Whale sharks (Rhincodon typus) are the largest shark in the world, and one of the largest fish in the world. They feed on plankton and travel large distances to find enough food to sustain their huge size, and to reproduce. Whale sharks are found in all the tropical oceans of the world. Their white spotted colouration makes these gentle giants easy to distinguish, and popular with snorkelers and divers at sites where they aggregate off the coast.
CHARACTERISTICS
Size: They're one of the largest fish species in the world, able growing up to 40 feet (12 meters) or more in length and weighing over 20 tons.
Filter Feeders: Despite their size, whale sharks are harmless filter feeders. They eat plankton, small fish, and crustaceans, filtering thousands of gallons of water through their gills. So they do not harm humans, or try to.
Wide Mouths:Their mouths can be up to 5 feet (1.5 meters) wide, and they can contain more than 300 rows of tiny teeth, though they don’t use them to chew.
Spotted Pattern: Their bodies are spotted with unique whitish grey spots. They're unique to every single whale shark, and scientists identify whale sharks using their spots, often like fingerprints with humans.
Gentle Nature: They are known to be docile and slow-moving, posing no threat to humans. Divers often swim alongside them respectfully.
Lifespan: Whale sharks can live 70–100 years, but they grow slowly and reach sexual maturity only around 25–30 years old.
Reproduction Whale sharks are ovoviviparous, meaning the eggs hatch inside the female’s body and she gives birth to live young. A single female can give birth to over 300 pups at once.
FUN FACT:
Each whale shark has a unique pattern of spots on its body — like a human fingerprint!
VIDEO OF WHALE SHARK:
˚⋆𐙚｡LEMON SHARKS 𖦹.ᡣ𐭩˚
TYPE: Fish - Shark
LITTER SIZE: 4 to 17 pups
OTHER COMMON NAMES: /
LIFE SPAN: 27 years
DIET DESCRIPTION: Fish, crustaceans, other sharks
MAX LENGTH: 3.4 metres
HABITAT AND RANGE: Lemon sharks are found coastally in tropical waters of the Atlantic and east Pacific Oceans. They primarily inhabit coral reefs and coastal systems such as mangroves and enclosed bays.
RELATIVE SIZE:
IUCN STATUS: Vulnerable (VU) - Decreasing population
Lemon Sharks (Negaprion brevirostris) are named for their yellow-brown color, which resembles the color of a lemon. They are commonly found in coastal waters and are known for their agility and hunting skills.
CHARACTERISTICS
Size: Lemon sharks grow to a maximum length of about 3.4 meters (11 feet).
Identification: Lemon sharks are mostly known by people for havin glarge ellow brown marks wihtout any specila markings, but they are also known for thier second dorsal fin being nearly as large as their first dorsal fin. This is unique because in most shark species, the first dorsal fin is significantly bigger.They have blunt, short snouts .
Diet: Lemon sharks are carnivorous and feed on a variety of fish, crustaceans, and other sharks.
Behavior: Lemon sharks are very social and they form preferential associations with otehr sharks. They are also able to learn by watching otehrs and have distinct personalities. Some are bolder than others. They are capable of resting on the seafloor and pumping water over their gills to breathe.
Habitat: Lemon sharks are primarily found in shallow coastal waters, especially in mangroves, coral reefs, and coastal bays of the Atlantic and eastern Pacific Oceans
Reproduction: Lemon sharks are viviparous, meaning they give birth to live young. They have a gestation period of about 12 months, and females give birth to litters of 4 to 1
VIDEO OF LEMON SHARK
༘˚⋆𐙚NURSE SHARKS ⋆𖦹.
TYPE: Fish - Shark
LITTER SIZE: 20 to 40 pups
OTHER COMMON NAMES: /
LIFE SPAN: 25 to 30 years
DIET DESCRIPTION: Fish, crustaceans, mollusks
MAX LENGTH: 4.3 meters
HABITAT AND RANGE: Nurse sharks are found in warm, coastal waters along the Atlantic Ocean, the Caribbean Sea, and the Gulf of Mexico. They inhabit coral reefs, mangroves, and seagrass beds, often resting in caves or under ledges during the day.
IUCN STATUS: Least Concern (LC) - Stable population
Nurse sharks (Ginglymostoma cirratum) are a species of large, slow-moving sharks found in warm coastal waters. They are known for their docile nature and distinctive appearance, making them a favorite among divers in certain regions. Here's more information about nurse sharks:
CHARACTERISTICS
Size: Nurse sharks typically grow to about 7–10 feet (2–3 meters) in length, though some individuals can reach lengths up to 14 feet (4.3 meters). They usually weigh between 200 and 330 pounds (90–150 kg).
Feeding Habits: Nurse sharks are bottom-dwelling, opportunistic feeders. They eat a variety of prey, including fish, crustaceans, and mollusks, using their strong jaws to crush and break open hard-shelled animals. They are often seen feeding on the sea floor or in shallow water.
Physical Appearance: Nurse sharks have a stout, cylindrical body with a broad, flat head and wide, downward-facing mouth. Their dorsal fins are small, and they have distinctive barbels (whisker-like appendages) on the front of their snouts that help them sense food.
Behavior: Nurse sharks are nocturnal and often rest during the day, sometimes in large groups. They are generally solitary feeders but may aggregate in areas where food is abundant. They are often seen resting in caves or under ledges during daylight hours.
Gentle NatureDespite their size and sharp teeth, nurse sharks are known for being calm and slow-moving. They are generally not aggressive toward humans and can be approached by divers in a non-threatening manner. However, they are still wild animals and should be treated with respect.
Reproduction: Nurse sharks are ovoviviparous, like whale sharks, meaning that the eggs hatch inside the female’s body, and she gives birth to live young. Nurse sharks typically have litters of 20 to 30 pups, though they can give birth to as many as 40 in some cases. The gestation period lasts about 6 months.
