Escaped bait: Bull shark Carcharhinus leucas with an intentionally attached harness rig

2020 ◽  
Author(s):  
Jayne M. Gardiner ◽  
Tonya R. Wiley
Keyword(s):  
Carcharhinus Leucas ◽  
Bull Shark

scholarly journals Bull shark ( Carcharhinus leucas ) exclusion properties of the sharksafe barrier and behavioral validation using the ARIS technology

2014 ◽  
Vol 2 ◽  
pp. 300-314 ◽  
Author(s):  
Craig P. O’Connell ◽  
Saang-Yoon Hyun ◽  
Chris B. Rillahan ◽  
Pingguo He
Keyword(s):  
Carcharhinus Leucas ◽  
Bull Shark ◽  
Behavioral Validation

scholarly journals Feeding patterns of two sympatric shark predators in coastal ecosystems of an oceanic island

2017 ◽  
Vol 74 (2) ◽  
pp. 216-227 ◽  
Author(s):  
Clément Trystram ◽  
Karyne M. Rogers ◽  
Marc Soria ◽  
Sébastien Jaquemet
Keyword(s):  
Trophic Ecology ◽  
Dietary Habits ◽  
Stomach Contents ◽  
Nitrogen Isotope ◽  
Oceanic Island ◽  
Apex Predators ◽  
Coastal Habitat ◽  
Galeocerdo Cuvier ◽  
Carcharhinus Leucas ◽  
Bull Shark

Stomach contents and stable carbon and nitrogen isotope analyses (δ13C and δ15N) were used to investigate the trophic ecology of two apex predators, tiger sharks (Galeocerdo cuvier) and bull sharks (Carcharhinus leucas), from Reunion Island to describe their dietary habits at both the population and individual levels. In this oceanic island, the tiger and bull sharks were more piscivorous and teutophagous than noted in previous research from other localities. The δ13C values suggested that bull sharks depended on more neritic organic matter sources than tiger sharks, confirming a coastal habitat preference for bull sharks. Moreover, the total length of the bull shark influenced δ13C values, with smaller individuals being more coastal than larger individuals. All indicators suggest that there is a higher degree of similarity between individual tiger sharks compared with the more heterogeneous bull shark population, which is composed of individuals who specialize on different prey. These results suggest that the two species have different functions in these coastal habitats, and thus, they must be considered independently in terms of conservation and management.

scholarly journals Increased Abundance and Nursery Habitat Use of the Bull Shark (Carcharhinus leucas) in Response to a Changing Environment in a Warm-Temperate Estuary

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Charles W. Bangley ◽  
Lee Paramore ◽  
David S. Shiffman ◽  
Roger A. Rulifson
Keyword(s):  
Habitat Use ◽  
Nursery Habitat ◽  
Changing Environment ◽  
Temperate Estuary ◽  
Carcharhinus Leucas ◽  
Bull Shark ◽  
Warm Temperate

scholarly journals Variable response to electric shark deterrents in bull sharks, Carcharhinus leucas

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
A. R. G. Gauthier ◽  
E. Chateauminois ◽  
M. G. Hoarau ◽  
J. Gadenne ◽  
E. Hoarau ◽  
...  
Keyword(s):  
New Caledonia ◽  
White Shark ◽  
Mitigation Measures ◽  
Control Board ◽  
Variable Response ◽  
Carcharodon Carcharias ◽  
Behavioural Changes ◽  
Carcharhinus Leucas ◽  
Bull Shark ◽  
Over Time

Abstract Although relatively rare, human-shark interactions and sharks bites are increasing globally, which has led to the development of various mitigation measures. Electric shark deterrents (ESDs) have, so far, been the most effective personal deterrents, but have only been scientifically tested on one of the species most frequently responsible for shark bites, i.e. white shark (Carcharodon carcharias). We tested the effectiveness of five ESDs (E-Shark Force, NoShark, Rpela v2, Freedom + Surf, Freedom + Surf—Shortboard) on bull sharks, Carcharhinus leucas, over a period of 21 days in September 2019, in New Caledonia. Standardised bait was attached 30 cm below an experimental board that had an active ESD for up to 15 min, or until a bull shark touched the bait or the board. We compared the numbers of baits taken, numbers of passes and reactions around the board, as well as the distance between the sharks and the board among ESDs and against a control board with bait and no active ESD. The Freedom + Surf was the most effective ESD, reducing the amounts of baits taken by 42.3%, while the Rpela v2 and Freedom + Surf—Shortboard also significantly reduced the number of baits taken by 16.5% and 16.2% respectively. Mean distance between sharks and the bait was not affected by the ESDs, but the number of approaches and the proportion of reactions were both significantly higher when the Freedom + Surf was active compared to other ESDs. The effectiveness of all ESDs decreased over time, with the likelihood of the bait being taken increasing and the number of approaches and distance between sharks and the bait decreasing. Our findings show that the ability of ESDs to deter bull shark varies between products, with the Freedom + Surf resulting in the most behavioural changes, followed by the Rpela v2 and Freedom + Surf—Shortboard. However, none of the products tested completely stopped sharks from taking the bait.

The Status of the Bull Shark, Carcharhinus leucas, in the Amazon River

Copeia ◽  
1972 ◽  
Vol 1972 (3) ◽  
pp. 601 ◽  
Author(s):  
Thomas B. Thorson
Keyword(s):  
Amazon River ◽  
Carcharhinus Leucas ◽  
The Status ◽  
Bull Shark

scholarly journals First photographic inland records of bull shark Carcharhinus leucas (Carcharhiniformes: Carcharhinidae) in Sumatran waters, Indonesia

2019 ◽  
Vol 22 ◽  
pp. 171-176
Author(s):  
Muhammad Iqbal ◽  
Elisa Nurnawati ◽  
Arum Setiawan ◽  
Zulkifli Dahlan ◽  
Indra Yustian
Keyword(s):  
River Basin ◽  
Nursery Area ◽  
Carcharhinus Leucas ◽  
Bull Shark ◽  
Musi River ◽  
Photographic Records

Two specimens (c.700 mm) of bull sharks Carcharhinus leucas (Müller & Henle, 1839) were caught and photographed by fishermen using trammel net on 29 September and 1 October 2017 in Musi River, South Sumatra province, Indonesia. These photos are considered as second record after 20 years (1997-2017), and first confirm inland record for Sumatra. Photographic records indicate specimens of C. leucas found in Musi River basin recorded about 75 km inland, and apparently very young juveniles. Further study and monitoring is needed to asses the possibility of the importance of Musi River basin as nursery area of C. leucas.

The bull shark (Carcharhinus leucas) and largetooth sash (Pristis perotteti) in Lake Bayano, a tropical man-made impoundment in Panama

1982 ◽  
Vol 7 (4) ◽  
pp. 341-347 ◽  
Author(s):  
Rafael Vásquez Montoya ◽  
Thomas B. Thorson
Keyword(s):  
Carcharhinus Leucas ◽  
Bull Shark

scholarly journals First evidence of multiple paternity in the bull shark (Carcharhinus leucas)

2017 ◽  
Vol 68 (1) ◽  
pp. 195 ◽  
Author(s):  
Agathe Pirog ◽  
Sébastien Jaquemet ◽  
Marc Soria ◽  
Hélène Magalon
Keyword(s):  
Multiple Paternity ◽  
Western Indian Ocean ◽  
Reproductive Behaviour ◽  
Selection Processes ◽  
Carcharhinus Leucas ◽  
Management Plans ◽  
Bull Shark ◽  
Zygotic Selection ◽  
First Time

The present study assessed the occurrence of multiple paternity in four litters of bull shark Carcharhinus leucas (n=5, 8, 9 and 11 embryos) sampled at Reunion Island in the Western Indian Ocean. Using 21 microsatellite loci, we revealed that two litters were generated from two sires each, demonstrating for the first time multiple paternity for this species. We also reported a high paternal skew (10:1 in Litter 1 and 7:1 in Litter 3), which may be because of post-copulatory or post-zygotic selection processes. These results contribute to a better understanding of the reproductive behaviour of the bull shark, which remains poorly documented. The present study must be expanded to assess the frequency of multiple paternity in this species, and to test for genetic or cryptic benefits (convenience polyandry), which is important for long-term conservation and management plans.

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