NORTHERN SHRIMP ÍSAFJARÐARDJÚP Pandalus borealis
Publication of Advice: 7. October 2024. Published by Marine and Freshwater Research Institute.
Advice
MFRI advises in accordance with the MSY approach that there should be zero catch in the fishing year 2024/2025.
Stock development
Fishable biomass index is below Ilim and Itrigger and the fishing pressure is below Fproxy.
Northern shrimp Ísafjarðardjúp. Catches, Fproxy and fishable biomass indices with Itrigger and Ilim.
Basis of the Assessment and reference points
Basis of the advice | MSY approach |
Management plan | There is no management plan for this stock |
Assessment type | Trends in biomass indicators |
Input data | Commercial catch and survey biomass indices (Icelandic inshore shrimp survey) |
Approach | Reference point | Value | Basis |
|---|---|---|---|
MSY approach | Fproxy | 0.5 | Historical relationship between catch and survey indices of inshore shrimp stocks. |
Precautionary approach | Ilim | 604 | Proxy for Blim. Biomass index value of 20% of the mean of the three highest indices. |
Itrigger | 604 | Ilim |
The ICES framework for short-lived stocks for which analytical assessment is not possible but trends in biomass indicators are assumed to reflect changes in stock dynamics was applied (Category 3 stock, ICES, 2022). The advice rule applied to this stock was evaluated to be precautionary and in-line with the MSY approach (Woods et. al 2023).
The survey biomass index of northern shrimp in Ísafjarðardjúp, along with catch, is used to calculate Fproxy (catch/survey biomass). The advice is based on multiplying the most recent index value with the target Fproxy value.
Northern shrimp Ísafjarðardjúp. Advice calculation.
Ay: Catch advice for 2023/2024 | 0 |
Biomass index | |
Latest index value (I2024) | 252 |
Fishing pressure proxy** | |
Fproxy,target: NA | 0.5 |
Biomass safeguard | |
Index trigger value (Itrigger) | 604 |
b: Index relative to trigger value, if I2024/Itrigger > 1 then 1 otherwise 0 | 0 |
Precautionary multiplier to maintain biomass above Blim with 95% probability | |
Catch advice for 2024/20251) | 0 |
% advice change2) | |
1) Ay+1 = Iy× Fproxy,target × b | |
2) The figures in the table are rounded. Calculations were done with unrounded inputs, and compared values may not match exactly when calculated using the rounded figures in the table. | |
Prospects
The shrimp juvenile index was low in 2016-2024.
Other information
The abundance of haddock has remained high since 2004. In 2020-2021, the abundance index of haddock was the highest in the study period.
The advice rule used for this stock was developed under the assumption of stable stock sizes of the predator species that prey on shrimp. Should these stock sizes change considerably the advice rule may no longer be valid.
Advice, Tac and catch
Northern shrimp Ísafjarðardjúp. Recommended TAC, national TAC, and catches (tonnes).
Fishing year | Recommended TAC | National TAC | Total catch |
|---|---|---|---|
1990/1991 | 3 000 | 3 000 | 3 114 |
1991/1992 | 2 500 | 2 500 | 2 555 |
1992/1993 | 2 500 | 2 500 | 2 501 |
1993/1994 | 2 500 | 2 500 | 2 511 |
1994/1995 | 2 100 | 2 100 | 1 955 |
1995/1996 | 2 700 | 2 700 | 2 756 |
1996/1997 | 2 300 | 2 300 | 2 265 |
1997/1998 | 1 450 | 1 450 | 1 426 |
1998/1999 | 1 000 | 1 000 | 1 025 |
1999/2000 | 1 800 | 1 800 | 1 715 |
2000/2001 | 1 200 | 1 200 | 1 287 |
2001/2002 | 1 500 | 1 500 | 1 497 |
2002/2003 | 1 000 | 1 000 | 989 |
2003/2004 | 0 | 0 | 0 |
2004/2005 | 0 | 0 | 0 |
2005/2006 | 0 | 0 | 0 |
2006/2007 | 0 | 0 | 0 |
2007/2008 | 0 | 0 | 0 |
2008/2009 | 0 | 0 | 0 |
2009/2010 | 0 | 0 | 0 |
2010/2011 | 0 | 0 | 0 |
2011/2012 | 1 000 | 1 000 | 1 040 |
2012/2013 | 500 | 500 | 527 |
2013/2014 | 1 100 | 1 100 | 1 128 |
2014/2015 | 750 | 750 | 801 |
2015/2016 | 700 | 700 | 767 |
2016/2017 | 484 | 484 | 491 |
2017/2018 | 322 | 322 | 343 |
2018/2019 | 456 | 456 | 459 |
2019/2020 | 565 | 565 | 570 |
2020/2021 | 586 | 586 | 582 |
2021/2022 | 0 | 0 | 12 |
2022/2023 | 523 | 523 | 529 |
2023/2024 | 0 | 0 | 0 |
2024/2025 | 0 |
References and further reading
ICES. 2022. ICES technical guidance for harvest control rules and stock assessments for stocks in categories 2 and 3. In Report of ICES Advisory Committee, 2022. ICES Advice 2022, Section 16.4.11. (https://doi.org/10.17895/ices.advice.19801564).
Pamela J. Woods, Bjarki Þór Elvarsson og Ingibjörg G. Jónsdóttir. 2023. Management strategy evaluation of harvest rates of the Northern shrimp Pandalus borealis in Arnarfjörður and Ísafjarðardjúp, Iceland. HV2023-45
MFRI Assessment Reports 2024. Northern shrimp Ísafjarðardjúp. Marine and Freshwater Research Institute, 24 August 2022.