SIODFA Fish Population Data Collection Programme

SIODFA Fish Population Data Collection Programme

In the period leading up to the establishment of a formal data collection programme by SIOFA, SIODFA vessels attempted to collect biological data during commercial fishing operations and so created an extensive database exists of fish lengths, weights, sex composition and gonad stage, especially for orange roughy.  This programme was expanded to alfonsino.  An extensive collection of otoliths has also been collected for analysis and considerable progress has already been made in Australia through government programmes on material collected by the F.T.s Southern Champion and Austral Leader – neither vessel no longer operating.  In one instance, biological data was collected from the start of the current fishery in 1999.  Some vessels.  This programme was formalized with the start of SIODFA in 2006.  

Measurements from 100 fish are attempted from seected trawl catches.  Such information assists in understanding the population structure and population dynamics of the exploited fish stocks.  Guidance for the manner of measuring the variables to be recorded is given in:

Patchell, G.  Instructions for the collection of biological samples from orange roughy in the southern Indian Ocean.  51 – 59.  In Shotton, R. (Comp.) 2006.  Management of Demersal Fisheries Resources of the Southern Indian Ocean.   Report of the fourth and fifth Ad Hoc Meetings on Potential Management Initiatives of Deepwater  Fisheries Operators in the Southern Indian Ocean (Kameeldrift East, South Africa, 12 – 19 February 2006 and Albion, Petitie Revière, Mauritius 26-28 April 2006) including specification of benthic protected areas and a 2006 programme of fisheries research.  FAO Fish. Circ. 1020.  90pp.g

The collecrtion of biologica data from fish samples is now rthe responsiblity of the flag states who undertake this activity thorough their observer programme.


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