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Project details

Title: Causes of declines in stocks of commercially important prawns in the northern prawn fishery (FIRDC project no. 89/13) 1989-1992
Id: 544
Acronym: Causes of decline in commercially important prawns in the northern prawn fishery
Investigator(s): Burke Hill
(Former) CSIRO Division of Fisheries/Fisheries Research - Cleveland [details]

Years: 1989 to 1992
Hierachy: Tropical Fisheries Resources » Tropical Prawn Ecology

List of surveys that this project was on.

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Survey InvestigatorDescription

R.C Pendrey (CSIRO) Cruise Objectives
A study of seasonal and interannual variability of recruitment of commercially important penaeid prawns is being undertaken in Albatross Bay, northeastern Gulf of Carpentaria. The offshore component involves sampling of adults, spawning females, larvae and recruiting subadults.
AB86 was the Twenty-sixth monthly survey cruise planned for the Albatross Bay study area, for the period August 1989 to May 1992. This sampling is part of a longer term study, for which 40 cruises have been completed during the period March 1986 to May 1989. On this cruise, the set of 10 selected nearshore grids were sampled twice, and the set of offshore grids were sampled once.
AB85 (Special Studies)
1. Sample inshore grids established during AB77 to examine possible tiger prawn nursery areas.
2. Sample selected inshore grids for larval prawns.
1. Carry out a trawl survey of prawn species distribution, size composition, population density and reproductive status in the study area.
2. Carry out sampling for larval prawns at selected stations.
3. Sample for phytoplankton species composition using a 37}i net. Filter samples for chlorophyll a level analysis at selected stations at 2 depths with replication during the cruise.
4. Record numbers and species of turtles collected in trawl samples.
5. Collect salinity and temperature profiles with the SDL at each plankton station.
6. Collect live P. semisulcatus and P. merguiensis for transport to the Cleveland laboratory for maturation experiments.
7. Spawn selected P. merguiensis females on board to attempt transport of live nauplii to Cleveland.
8. Collect water samples for nutrient analysis.
9. Collect samples of both immature and ripe P. semisulcatus for gut content analysis.
10. Collect samples for Isotope analysis of three species at three depths into three size groups.
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