Stock assessment of sardine (Sardina pilchardus, Walb.) in the Adriatic Sea with an estimate of discards

Authors

  • Alberto Santojanni ISMAR - CNR, Sezione Pesca Marittima, Largo Fiera della Pesca
  • Nando Cingolani ISMAR - CNR, Sezione Pesca Marittima, Largo Fiera della Pesca
  • Enrico Arneri ISMAR - CNR, Sezione Pesca Marittima, Largo Fiera della Pesca
  • Geoff Kirkwood Renewable Resources Assessment Group (RRAG), Department of Environmental Science and Technology
  • Andrea Belardinelli ISMAR - CNR, Sezione Pesca Marittima, Largo Fiera della Pesca
  • Gianfranco Giannetti ISMAR - CNR, Sezione Pesca Marittima, Largo Fiera della Pesca
  • Sabrina Colella ISMAR - CNR, Sezione Pesca Marittima, Largo Fiera della Pesca
  • Fortunata Donato ISMAR - CNR, Sezione Pesca Marittima, Largo Fiera della Pesca
  • Catherine Barry Marine Resources Assessment Group (MRAG)

DOI:

https://doi.org/10.3989/scimar.2005.69n4603

Keywords:

sardine, Adriatic Sea, discards, observer data, regression tree models, stock assessment, population dynamics methods, Virtual Population Analysis (VPA)

Abstract


Analytical stock assessment of sardine (Sardina pilchardus, Walb.) in the Adriatic Sea from 1975 to 1999 was performed taking into account the occurrence of discarding at sea of sardine caught by the Italian fleet. We have attempted to model the fishermen’s behaviour using data collected by an observer on board fishing vessels. This enabled us to estimate the amounts of discards, which were added to the catches landed, collected by ISMAR-CNR Ancona. Discards were calculated for the period 1987-1999, as their values were negligible before 1987. Stock assessment on the entire data series from 1975-1999 was carried out by means of Virtual Population Analysis (VPA). Discarding behaviour differs among ports due to different local customs and market conditions. The quantity added to the annual total catch ranged from 900 tonnes to 4000 tonnes, corresponding to between 2% and 15% of the total corrected catch. VPAs indicated that mid-year sardine stock biomass rose steadily from 400,000 tonnes in 1975 to a peak of 950,000 tonnes in 1984. Subsequently, biomass declined steadily to the more recent values, around 300,000 tonnes. Although discarded quantities were relatively high, their influence on stock assessment was not strong because of the high level of both catch and, in particular, estimated biomass at sea.

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Published

2005-12-30

How to Cite

1.
Santojanni A, Cingolani N, Arneri E, Kirkwood G, Belardinelli A, Giannetti G, Colella S, Donato F, Barry C. Stock assessment of sardine (Sardina pilchardus, Walb.) in the Adriatic Sea with an estimate of discards. scimar [Internet]. 2005Dec.30 [cited 2022Aug.10];69(4):603-17. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/288

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