Title

Catch and Effort Cells for Rock Lobster Quota Fishery 

Alternate title

CE_ROCK_LOBSTER_2001 

Purpose

The CE_ROCK_LOBSTER_2001 layer provides a grid of cells on which various summary catch and effort data for the Victorian Rock Lobster and Giant Crab quota fisheries can be imported, displayed, and analysed. Catch and effort data can be used to display trends in fishing activity. Summary information such as extent of catch, total catch, effort, catch per unit area, and catch per unit effort can be represented. This information is crucial to ensure effective fisheries management, research and monitoring. This data set may be displayed in conjunction with a variety of environmental data capable of providing an insight into the behaviour of the Rock Lobster and Giant Crab. A depth model, ocean currents, temperature profiles and salinity levels, are useful data that may assist in gaining an understanding into the ecology of the Rock Lobster and Giant Crab. 

Credit

Ralph Roob, Allister Coots 

Supplemental Information

History: 4 Feb 2004 - Creation of original layer and addition of new attributes and attribute values. 3 Mar 2005 - Exported layer to shapefile and projected to GDA. Relationship to other Datasets: The shorelines used in this layer are derived from the Royal Australian Navy Hydrographic Office's 1:250,000 National Bathymetric Map Series. Current Design Issues: This layer was originally designed in accordance with the specifications set out in the Victorian Pot Fishing Logbook. It was later revised based on feedback received from the Catch & Effort unit, Department of Primary Industries (DPI), Queenscliff. Related Documents: None MAFRI Fishing Logbook CGDL DEPTH250 layer http://sysx/cgi-bin/websql/metadata/dataset_full.hts?name=DEPTH250 

Status

Completed  

Horizontal Accuracy

250m  

Code

4283 

Maintenance and update frequency

As needed  

Topic category

• Farming

Use limitation

DataVic 

Classification

Unclassified  

Statement

Dataset Source: Victorian Pot Fishing areas RAN Hydrographic Office - 1:250,000 National Bathymetric Map Series Dataset Originality: Derived 

Description

Collection Method: Generated from Latitude and Longitude 

Description

The polygons from a depth-stratified layer of area cells were dissolved into this dataset by their grid-reference area codes after the island polygons had their attributes changed to appear as separate features in the dissolved layer. In the new dataset, some extra attributes were added and other attributes were changed, and the polygons attributed with the new values. This dataset was later converted to a shapefile and projected into the Geocentric Datum of Australia (GDA), and other attributes were added to this projected shapefile to give each polygon its Australian Standard Geographic Information Systems Geographic Data Interchange of feature-coded digital mapping data AS2482-1989 code and area in square metres and hectares. 

Classification

Unclassified  

Attribute Quality

Comments

All attributes have been validated by the Habitat Ecology section, DPI Queenscliff, and are complete. 

Positional Accuracy

Comments

Grid cell boundary linework is generated from specific geographic coordinates, many of which are based on divisions of 10 minutes in longitude and latitude. 

Conceptual Consistency

Comments

This data has been validated by the Habitat Ecology section, DPI Queenscliff 

Missing Data

Comments

The layer is complete for the Victorian jurisdiction of the Rock Lobster Fishery The layer is complete for the Victorian jurisdiction of the Rock Lobster quota Fishery 

Excess Data