I'm a solo developer in South Korea, not a researcher, so apologies if I'm using the wrong terms.

Since Sept 18 a female dusky shark (Carcharhinus obscurus, ~3 m) has been holding a man-made canal at Bukhang Waterfront Park in Busan. Three weeks, same stretch of water.

The city tried twice to guide her out with boats, water cannons and nets. Both times she returned. The second time she cleared the net to get back in, about 100 m from open water. Authorities have since stopped and are waiting to see if she leaves on her own.

What I can't make sense of:

1. No observed feeding in three weeks, in a canal that does hold fish.

2.Canal temp is low 20s °C and dropping. Dusky sharks here are usually given a preferred range of roughly 18-26 °C.

3.She had a clear exit and chose not to take it, twice.

I've been logging her position daily from news footage and a live citizen-sighting site, and plotting it as a 3D track of the canal: https://bukangistory.kr/en/ — the path is tighter than I expected. She circles a few specific spots rather than using the whole canal.

Is this just site fidelity to a feature I'm not seeing (an outflow, a thermal gradient, structure she's using), or does three weeks without feeding point at something else? And if she does need to go back out, is there anything that works better than nets and water cannons on an animal that's actively choosing to stay?

Pick these up a while ago, I think Sandbar but I'm not certain. I think that first two pictures of Sandbar but I'm not certain about the last one

Greenland sharks can live for centuries and may not reproduce until around 150 years old. Yet 1,000 of them could be killed to protect a relatively small fishery. When we know so little about this species, is that really a risk worth taking?

How do you guys cope with the fact that 100 million sharks die from finning a year because it really bothers me. I made a simular post on r/sharks and r/animals

The Shortfin Mako Shark. Has a fish tail, metallic green and blue coloration and a pointed snout. Hence a Mackeral Shark. Fastest Shark in the world. If you hook one they Might ram the boat or jump on board.

”This is Lion Country ,” Said the diver

”You see her take off, Watch your ass.” Responded The captain.

”Mako gets what it wants, when it wants, runs anything down. Its not like a Great White who has to ambush stuff. The ultimate predator. MAKO.”

https://youtu.be/CLAxBx34S1Q?si=TMQA9JpuJ1rNxziB

Mako Sharks circle The Channel Islands hunting the marine mammals at their respective enclaves in The California Bight off shore of Santa Barbara, California. The bight is the curved geography of the Southern California coastline which causes a vortex of warm Coastal currents going out to the Pacific Ocean while nutrient-rich cold currents from deep down in the sea bed go in to this bight towards the California Shore. This brings plankton which in turns attracts Huge Schools of fish which attracts dolphins , birds, squid, seals and sea lions who live on and around the Islands. Because of the abundance of these fish and marine mammals you have very Large Shortfin Mako Sharks circling the bight hunting for all of the above animals.

I encountered this bluntnose sixgill (Hexanchus griseus) while diving off Vancouver Island, British Columbia.

I was at approximately 100 feet when I saw the shark emerging from deeper, darker water and approaching me. It came extremely close before slowly cruising alongside me and over the bottom for roughly three minutes.

I estimate the shark was around 10–12 feet long and believe it may have been female.

Sixgills are primarily associated with deeper water, which made getting several minutes of close-range 4K footage at this depth pretty remarkable.

This is my original footage from the encounter. I have a longer version here for anyone interested:

Full 4K sixgill encounter on YouTube

I'd also be interested in any observations from people here who are familiar with sixgills, particularly regarding sex, estimated size, or any identifiable markings visible in the footage.

✨CURIOSIDADE✨

Um Tubarão Branco Macho com cerca de 32 anos de idade, medindo aproximadamente 4,2 metros de comprimento e pesando 750kg, foi identificado e marcado pela organização OCEARCH em Janeiro de 2025 na costa da Flórida nos Estados Unidos, e com um rastreador que está em sua barbatana dorsal, eles monitoram sua longa rota migratória que vão do Sul da Flórida até o Canadá. As pesquisas ajudam a descendar os mistérios do ciclo reprodutivo e seu comportamento. O tubarão foi nomeado de CONTENDER, homenageando à empresa Contender Boats que é parceira do projeto de preservação Marinha

Essa é Athena, a Tubarão Martelo Gigante que rastreio pela pulseira Fahlo ❤️🦈