Habitat and Biology
Depth zone: Slope (200 m - 1000 m). Vertical distribution: Demersal/Benthic.
Considered a single stock: Yes
Factors affecting the fisheries and the stockRegulations and their effects
The northern part of ICES Subdivision IIIa (Skagerrak) is shared between the EU and Norway. However, according to the tri-lateral treaty between Denmark, Norway, and Sweden (Skagerrak Treaty) fishing vessels from each of the three countries may operate freely in each country’s waters. The directed fishery for grenadier is mainly carried out in the Norwegian EEZ, and the fishery has been largely unregulated and unrestricted. The EC introduced unilateral TACs for IIIa in 2004 and 2005, but this restriction did not apply in the Norwegian EEZ, for which the trilateral Skagerrak treaty between Denmark, Norway, and Sweden is in force. The Skagerrak treaty allows Danish and Swedish vessels to operate freely in the Norwegian zone, and Norway has not set any TAC or introduced other regulations on grenadier fishing in IIIa or IVa. Therefore, the Danish (and Swedish) fleet(s) could in principle fish unrestricted by the (EU) TAC for grenadier in these waters.
Following an agreement between the EU and Norway in February 2006, a TAC of 2700 t for the EU in 2006 was set for IIIa including the Norwegian EEZ
No assessment was carried out for this stock and interpretation of the current status was based on landings (Figure 126.96.36.199.1), cpue (Figure 188.8.131.52.2),
and mean length in catches (Figure 184.108.40.206.3). More scientific data to elucidate the productive features of this stock is needed to explain the special development of the exploitation of this management unit.Comparison with previous assessment and advice
There is no change in the advice for this stock.
Overall Assessment Results Table 220.127.116.11.
Total landings (tonnes) of roundnose grenadier from Divisions IIIa & IVa (WG estimates).
|Year ||Denmark ||Norway ||Sweden ||TOTAL |
|1988 ||612 || ||5 ||617 |
|1989 ||884 || ||1 ||885 |
|1990 ||785 ||280 ||2 ||1067 |
|1991 ||1214 ||304 ||10 ||1528 |
|1992 ||1362 ||211 ||755 ||2328 |
|1993 ||1455 ||55 || ||1510 |
|1994 ||1591 || ||42 ||1633 |
|1995 ||2080 || ||1 ||2081 |
|1996 ||2213 || || ||2213 |
|1997 ||1356 ||124 ||42 ||1522 |
|1998 ||1490 ||329 || ||1819 |
|1999 ||3113 ||13 || ||3126 |
|2000 ||2400 ||4 || ||2404 |
|2001 ||3067 ||35 || ||3102 |
|2002 ||4196 ||24 || ||4220 |
|2003 ||4302 || || ||4302 |
|2004 ||9874 ||16 || ||9890 |
|2005 ||11922 || || ||11922 |
|2006 ||2261 ||4 || ||2265 |
|2007* ||+ ||1 || ||1 |
|* Preliminary data. |
|Figure 18.104.22.168.1. Total landings of roundnose grenadier from Divisions IIIa & IVa (WG estimates). |
|Figure 22.214.171.124.2. Danish cpue by main ICES rectangle in Division IIIa based on logbook records. |
|Figure 126.96.36.199.3. Length distribution Danish catches of roundnose grenadier in 1987, 2004, and 2005. Note: 1987 consists of combined data from research vessel and fishery. |
No reference points have been defined for this stock.
Scientific AdviceSingle-stock exploitation boundaries
Due to its low productivity, roundnose grenadier can only sustain low rates of exploitation. ICES reiterates the advice to constrain catches to 1000 t, which corresponds to the catch level before the expansion of the fishery (1988–1991). The fishery should not be allowed to expand again unless it can be shown that it is sustainable.
There is no management objective for this stock.
Management AdviceManagement considerations
At present there is no fishery, but any future directed fisheries should be managed on a precautionary basis and monitored closely in order to ensure sustainability of the exploitation of this stock.
The period before the expansion of the fishery is equal to the years 1988–1991.
Biological State and Trend
It has not been possible to assess the status of the stock. However, as scientific investigations have indicated slow growth of this species, the drastic increase in exploitation of this stock during the years 2003–2005 gave rise for serious concern, even if no clear signs of the increasing fishing pressure were observed in recent years. No directed fishery has taken place since 2007, due to retirement of the fishers. A decrease in mean length in the catch from 1987 to 2004 and 2005 indicates heavy exploitation on this stock, see Figure 188.8.131.52.3.
Source of information
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.