57 results
Environment
Industry
Industry

Mercury content of tropical sharks

Project number: 1983-055
Project Status:
Completed
Budget expenditure: $0.00
Principal Investigator: Richard Slack-Smith
Organisation: Department of Agriculture and Fisheries (NT)
Project start/end date: 28 Dec 1984 - 31 Dec 1984
Contact:
FRDC

Objectives

1. Sample up to 1000 sharks of various spp for total mercury content
determine alkyl mercury levels in approximately 150.
2. Examine effects of sex, length, locality on levels. What implications for future of this shark fishery?
3. Sample up to 200 sharks for selenium content

Final report

Author: Dr. J.M. Lyle
Final Report • 1984-12-31 • 1.86 MB
1983-055-DLD.pdf

Summary

Total mercury, alkyl mercury and selenium concentrations in the muscle tissue of several species of pelagic sharks from northern Australian waters are reported. Mean mercury concentrations ranged between O .13 mg /kg for Carcharhinus brevipinna and 1. 94 mg/kg for C. amblyrhyn choides. Maximum values exceeded 1.5 mg/kg in nine of the species studied and the highest recorded concentration was 3.7 mg/kg for Sphyrna mokarran.

Mercury concentrations were highly dependent on the size of shark, a relationship that was adequately represented by the power function. Males of most of the species studied had significantly higher levels of mercury than females of similar size.

Long-term abundance index for goldband snapper in the Timor Sea - A pilot study

Project number: 1994-155
Project Status:
Completed
Budget expenditure: $67,859.85
Principal Investigator: David Ramm
Organisation: Department of Agriculture and Fisheries (NT)
Project start/end date: 29 Mar 1995 - 30 Mar 1997
Contact:
FRDC

Objectives

1. Develop techniques for obtaining repeatable indicies of relative abundance for goldband snapper (Pristipomoides spp.), and other selected groundfish, applicable to habitats commonly found in the Timor Sea including the Timor Box
2. Obtain additional information on the spatial and seasonal distribution of goldband snapper and other groundfish in the Timor Sea
Industry
View Filter

Organisation