Fine-scale movements of juvenile blacktip reef sharks Carcharhinus melanopterus in a shallow nearshore nursery

2019 ◽  
Vol 623 ◽  
pp. 85-97 ◽  
Author(s):  
LW George ◽  
APB Martins ◽  
MR Heupel ◽  
CA Simpfendorfer
Keyword(s):  
Fine Scale ◽  
Reef Sharks ◽  
Carcharhinus Melanopterus

Fine-scale movement and activity patterns of Caribbean reef sharks (Carcharhinus perezi) in the Bahamas

2017 ◽  
Vol 101 (7) ◽  
pp. 1097-1104 ◽  
Author(s):  
Oliver N. Shipley ◽  
Jacob W. Brownscombe ◽  
Andy J. Danylchuk ◽  
Steven J. Cooke ◽  
Owen R. O’Shea ◽  
...  
Keyword(s):  
Activity Patterns ◽  
Fine Scale ◽  
The Bahamas ◽  
Caribbean Reef ◽  
Reef Sharks

scholarly journals Relationship between the biomass of reef shark and fish in South Morotai Waters, North Maluku, Indonesia

2020 ◽  
Vol 21 (12) ◽  
Author(s):  
JIBRIEL FIRMAN SOFYAN ◽  
AMBARIYANTO AMBARIYANTO ◽  
KEN SUWARTIMAH ◽  
Abdul Hamid A. Toha
Keyword(s):  
Regression Analysis ◽  
Positive Relationship ◽  
Biomass Estimation ◽  
Functional Composition ◽  
Visual Census ◽  
Underwater Visual Census ◽  
Reef Shark ◽  
Triaenodon Obesus ◽  
Reef Sharks ◽  
Carcharhinus Melanopterus

Abstract. Sofyan JF, Ambariyanto A, Suwartimah K, Toha AHA. 2020. Relationship between the biomass of reef shark and fish in South Morotai Waters, North Maluku, Indonesia. Biodiversitas 21: 5605-5613. This study aims to determine the biomass of reef shark and fish in South Morotai Waters in North Maluku, Indonesia. The Audible Stationary Count and Underwater Visual Census method were used to collect the data of reef sharks and fish. Seven and one site locations of coral reef and shark ecosystems were surveyed and, the data were analyzed using regression analysis to obtain a correlation between the variables. The three reef sharks found were Carcharhinus melanopterus, Triaenodon obesus, and Carcharhinus amblyrhynchos. Biomass estimation of reef sharks and fish ranged from 0.59 to 19.97 kg/ha and 30.95 kg/ha to 49.92 kg/ha, consisting of 8 families. In the area of aggregations, both species were found in 7 sites, and the population of reef shark amounted to 86.96 kg/ha and fish was around 55.705 kg/ha, consisting of 9 families. There was a positive relationship between the biomass of reef shark and fish in South Morotai waters, and the index of determination was 0.8043, showing that the biomass of reef shark was influenced by that of fish. These results indicated the importance of biomass in determining the functional composition and diversity of reef shark and fish.

scholarly journals Home range of newborn blacktip reef sharks (Carcharhinus melanopterus), as estimated using mark-recapture and acoustic telemetry

Coral Reefs ◽  
2020 ◽  
Vol 39 (5) ◽  
pp. 1209-1214 ◽  
Author(s):  
Ian A. Bouyoucos ◽  
Martin Romain ◽  
Lorine Azoulai ◽  
Kim Eustache ◽  
Johann Mourier ◽  
...  
Keyword(s):  
Home Range ◽  
Acoustic Telemetry ◽  
Mark Recapture ◽  
Reef Sharks ◽  
Carcharhinus Melanopterus

scholarly journals Response of blacktip reef sharks Carcharhinus melanopterus to shark bite mitigation products

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Madeline Thiele ◽  
Johann Mourier ◽  
Yannis Papastamatiou ◽  
Laurent Ballesta ◽  
Eric Chateauminois ◽  
...  
Keyword(s):  
Reef Sharks ◽  
Carcharhinus Melanopterus

Physiological response and immediate mortality of gill-net-caught blacktip reef sharks (Carcharhinus melanopterus)

2017 ◽  
Vol 68 (9) ◽  
pp. 1734 ◽  
Author(s):  
Derek R. Dapp ◽  
Charlie Huveneers ◽  
Terence I. Walker ◽  
Richard D. Reina
Keyword(s):  
Conservation Status ◽  
Management Strategies ◽  
Population Monitoring ◽  
Mortality Rates ◽  
Plasma Lactate ◽  
Elevated Plasma ◽  
Gill Net ◽  
Reef Sharks ◽  
Carcharhinus Melanopterus ◽  
Related Mortality

To investigate factors contributing to immediate mortality in gill-net-caught elasmobranchs, we caught and blood sampled a total of 64 sharks and rays. Blacktip reef sharks (Carcharhinus melanopterus) were the most commonly caught species and had significantly elevated plasma lactate (mean 23.3 mM) and potassium (mean 6.2 mM) concentrations following capture, suggesting physiological disturbance. The overall immediate mortality rate of C. melanopterus was 38% and mortality was significantly influenced by body size, but not location of entanglement or sex. Of the other species caught, nervous sharks (Carcharhinus cautus) were of particular concern, because this species is often caught as bycatch by gill-net fisheries throughout its range and experienced high immediate mortality rates when captured (66%; n = 12) in the present study. The results suggest that juvenile C. melanopterus are particularly susceptible to gill-net-related mortality and that fisheries management strategies for C. melanopterus bycatch should focus on reducing the likelihood of juvenile sharks encountering this gear. Given that this species is not currently considered to be threatened with extinction, population monitoring should be performed such that the suggested regulations can be implemented if populations decline to levels threatening the conservation status of the species.

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