Project

Tracking Bimini’s sharks

Species
  • Rays & Skates
  • Sharks
Years funded
  • 2013, 2014, 2015, 2016
Status
  • Active
Project type
  • Research
Description

To protect Bimini’s great hammerheads, we need to know where they go. With the help of a network of receivers, Tristan, director of the Bimini Biological Field Station, is recording and studying the movements of this shark and other species around the island.

Tracking Bimini’s sharks

Tristan Guttridge

Project leader
About the project leader
I have always had an extraordinary passion for sharks. I have been utterly mesmerised by them for as long as I can remember. That probably sounds extreme, but sharks have always been part of my life and being in the water with them is where I feel most inspired. I was first introduced to animals and marine life by my granddad. He and I would explore the textures and creatures of our garden and he would tell me about the birds, bees, trees and leaves. He had a voice like David Attenborough’s and I...
Tracking Bimini’s sharks

Sam Gruber

Project leader
About the project leader
As a child in the late 1940s, I was what we in Miami called a ‘water baby’. I used to go down to the docks and look at every fish that was brought in. While the other kids were playing baseball, I was out there looking for sharks and fishes and walking the beaches for miles, collecting seashells. At age 12 I taught myself to scuba dive, and when I was a teenager we used to sail out to the reefs on an 80-foot schooner and spend the weekend on a reef, feasting on the fish we had speared. My interest...
PROJECT LOCATION : Bimini, The Bahamas
All news about this project
By Mauritz Bergman, 5th May 2017
Keeping ‘Big Brother’ alive
‘Big Brother’. For anyone reading these words who also knows George Orwell’s novel 1984, a negative image of a society under total surveillance by the authorities will probably come to mind. To me, they signify an opportunity to better understand distribution patterns of free-ranging animals,…
By Alexandra McInturf, 26th May 2016
Tagging tigers on the line

In the glowing light of emerging daybreak I could barely see the numbers on my watch: 6.30. The air was chilly and all I could hear was the gentle slapping of water against the hull of the boat. The bow turned towards the Tiger Grounds, we…
By Matt Smukall, 15th April 2016
Born to be wild
Tiger shark. For some people these words may conjure up an image of one of the ocean’s top predators: large, fierce and considered to be dangerous. Me, I think of one of the cutest and most distinctly patterned animals in the ocean. At the Bimini…
By Tristan Guttridge, Sam Gruber, 10th March 2016
Hammerhead pitstop
How to tag a great hammerhead For me, researching endangered great hammerhead sharks is one of the most inspiring and challenging projects currently conducted at the Bimini Biological Field Station, or Shark Lab. These sharks are truly immense, in every way possible. It’s not only their…
By Tristan Guttridge, Sam Gruber, 11th January 2016
A ray with a caveman’s weapon
Although it was eight years ago, I still remember my first encounter with a sawfish as one of the most extraordinary experiences of my life. And, in light of our recent paper ‘Occurrence and habitat use of the Critically Endangered small tooth sawfish, Pristis pectinata…
By Maurits Van Zinnicq Bergmann, 30th September 2015
Mass surveillance: not all that bad?
Sixty-six years ago, George Orwell portrayed in his novel 1984 a fictional entity called ‘Big Brother’ who is claimed to rule a totalitarian state, creating a society that is under total surveillance by the authorities. Citizens are constantly reminded of this by the slogan ‘Big…
Project details

Elasmobranch research, education and conservation in Bimini, The Bahamas

Key objective

The goal of the Bimini Biological Field Station Foundation is to advance knowledge of the biology of sharks and rays, and the role that they play in the marine ecosystem, and to improve their management and conservation as well as enhance public perception and understanding of these fishes.

Why is this important

Adequate conservation and management of shark populations is becoming increasingly important on a global scale with declines documented worldwide. A recent study estimated the total catch and fishing-related mortality for sharks globally was more than 100,000,000 sharks per year. There is an urgent need for the collection of biological information on many shark species, which the Bimini Biological Field Station Foundation aims to address.

Background

The following background information relates to two of our objectives that show the diversity of projects that the Bimini Biological Field Station Foundation conducts. One is pertinent to management and conservation of large coastal sharks, specifically the great hammerhead, and the other harnesses the lemon shark as a model species for advancing behavioural theory and understanding individual variation.

Great hammerhead: a crucial need for spatial data
The great hammerhead shark Sphyrna mokarran is a target or by-catch species in a wide variety of fisheries throughout its range, and substantial population declines are suspected to have occurred in many areas as a result of fishing. The great hammerhead in particular is highly sought after in the international shark fin trade because of its large fins. It has also been added to CITES (Convention on International Trade in Endangered Species) Appendix II and is categorised as Endangered by the IUCN (International Union for the Conservation of Nature) Red List.
A real conundrum for fisheries across the globe is how to reduce capture of hammerheads? Prohibiting retention would not be effective as they have the highest at vessel mortality of any species (about 90%). Thus it is crucial that we understand more about space, habitat use and behaviour of this species. Do they use migratory corridors? Are there spatial hotspots?

Consequences and cause of personality
Personality differences are widespread throughout the animal kingdom and represent individual behavioural variations that are consistent over time. They determine the way animals react to novel and challenging situations, which can affect resource acquisition, social interaction, survival and reproduction. Personalities have been well studied in freshwater fish. However, despite important ecological and evolutionary consequences, nothing is known about personality variation in sharks and other large marine fishes. Personality variation in apex predators, such as sharks, could have implications for the health of marine ecosystems. The attributes of the lemon shark Negaprion brevirostris system in Bimini allow a range of questions to be explored that cannot be asked of many other wild-ranging animal species. Such as, is personality heritable? How do mortality and growth of juvenile sharks correspond to behavioural types or syndromes? Does this correspondence change over ontogeny and ecological conditions?

Aims & objectives

The aims and objectives of the projects that the Bimini Biological Field Station Foundation conducts are to:

  • Improve understanding of the movement and behaviour of great hammerheads through electronic tracking over three years to provide data critical to the species’ management to the US’s National Marine Fisheries Service.
  • Test 100 lemon sharks for two behavioural traits: exploration and sociality. Results will contribute to understanding what maintains phenotypic and genetic variation of traits that affect fitness.
  • Examine the driving forces behind shark movements and migrations through the tagging of lemon, bull, black tip and tiger sharks.