If a shark or other animal is captured, the pressure on the line triggers the communications unit, which then sends an alert via phone call, email and text message to a boat crew who will respond to the animal within 30 minutes. If it is a target shark, namely a white, bull or tiger shark, it will be tagged and then released one kilometre offshore. All other marine animals caught are released immediately.

Catch-and-release deters sharks from beaches

Researchers conducted trials using SMART drumlines in New South Wales, Australia, to catch and release sharks, particularly White Sharks. The study aimed to quantify the short-term post-release movements and the longer-term fate of these sharks.

Sharks were caught using SMART drumlines deployed about 500 meters from shore. Once captured, they were quickly secured to a research vessel, minimising potential injuries. The sharks were tagged with satellite-linked radio transmitting tags and acoustic transmitters to monitor their movements post-release.

A quick pass into view.

Enigmatic world of shark and ray behaviour unveiled

Elasmobranchs have become lucrative targets with the depletion of traditional fish stocks and the surge in the shark fin trade. Although, in recent decades, much scientific evidence has challenged traditional misconceptions, stereotyped media portrayals persist, and they hinder conservation efforts. So, this special issue was created to highlight the complex behaviour and cognition of sharks and rays.

Southern Resident killer whale holding in its mouth a harbour porpoise calf that was eventually drowned

Why are orcas killing porpoises?

A comprehensive study published in the journal Marine Mammal Science analysed over 60 years of recorded interactions between Southern Resident killer whales (SRKW) and porpoises in the Salish Sea. This endangered population of orcas, known for their fish-based diet, particularly Chinook salmon, has been involved in numerous incidents of porpoise harassment, leading to the deaths of many porpoises.

Possible explanations

The study proposes three main reasons for this behaviour:

Great white shark
Great white shark

Not all great white sharks journey alone

Two male great white sharks, named "Jekyll" and "Simon", tagged off Georgia's coast in December, displayed a groundbreaking migration pattern.

From April, Jekyll and Simon's joint journey saw them traverse the Atlantic Coast, passing places like Ocracoke and Virginia Beach in a synchronised manner. While sharks sometimes gather for mating or feeding, their migrations are usually solitary.

Hungry shrimp innovate more
Both size and hunger drove the prawns to innovate to get food, but only under certain circumstances

Hungry shrimps get smarter

Behavioural innovation is thought to play an important role in enabling animals to cope with environmental change. Research on animal innovation has focused on terrestrial and freshwater vertebrates, but few animals face environmental variation as extreme as those living in littoral zones, where physical and social conditions change dramatically from moment to moment.

When the trumpetfish swims alongside another species, it either remains hidden or is not recognised as a threat due to its altered shape
When the trumpetfish swims alongside another species, it either remains hidden or is not recognised as a threat due to its altered shape.

The trumpetfish's unique hunting strategy

The trumpetfish, with its long, slender body, shadows non-threatening species like the parrotfish. This allows it to get closer to its prey, such as damselfish, without being detected. Dr Sam Matchette, a leading researcher from the University of Cambridge, explains that when the trumpetfish swims alongside another species, it either remains hidden or is not recognised as a threat due to its altered shape.

Tetra fish
Tetra fish

Neon tetra fish wait their turn when evacuating through narrow opening

Scientists have observed neon tetra fish queuing up when exiting through a narrow opening, according to a study in the journal Scientific Reports.

In the study, Aurélie Dupont, a biological physicist in the Laboratoire Interdisciplinaire de Physique at University Grenoble Alpes, and her team set up two fish tanks connected to each other by a narrow opening. The diameter of the passageway varied from 1.5 to 4 centimeters.

A research team has demonstrated that fish think "it's me" when they see themselves in a mirror or picture.

Fish recognises itself in photographs

A new study demonstrates how animals recognise self-images.

Some animals have the remarkable capacity for mirror self-recognition (MSR), yet any implications for self-awareness remain uncertain.

In a test of MSR ability in cleaner fish, mirror-naive fish initially attacked photograph models of both themselves and unfamiliar strangers. In contrast, after all fish had passed the mirror mark test, they did not attack their own (motionless) images, but still frequently attacked those of unfamiliar individuals.

Dolphins speak "baby talk" to offspring

Have you ever noticed that when adults speak to babies or small children, they speak in a distinctively specific manner? As if by instinct, they speak in a high-pitched voice, with clear pronunciation and longer pauses between words.

It seems that this “baby talk” is not reserved for humans. Researchers have discovered that dolphins too indulge in baby talk—by changing their characteristic whistles and frequencies—when they communicate with their offspring.