Download the complete Stock Status Report  for Pseudopentaceros richardsoni

Stock distribution and identity

 The Pentacerotid Pseudopentaceros richardsoni (Smith 1844) is a southern circumglobal, benthopelagic species inhabiting outer shelf and upper continental shelves as well as seamounts and underwater ridges (100-1000 m) between 0 and 1 000 m depth (Heemstra, 1986). The species inhabits such habitats at e.g. Tristan de Cunha, on the Walvis Ridge and seamounts off South Africa (Southeast Atlantic); south of Madagascar (Western Indian Ocean) as well as in southern Australia, New Zealand and the Southeast Pacific. The potential distribution area in the SEAFO CA and adjacent waters is shown in Figure 1. It is unlikely that the species is abundant south of about 40°S, i.e. in Sub-Area D.

It is known from adjacent areas that adults inhabit the steep and flat hard bottoms down to 800 m on the seamounts and underwater ridges in the open ocean. Eggs, larvae and juveniles are pelagic. Pelagic armourhead recruit to the summit of the seamounts after approximately 4 years of pelagic life and thereafter aggregates.


 Figure 1: Potential geographical distribution of P. richardsoniin the SEAFO CA and adjacent waters

Reported retained catches and discards

Starting in 1976, Table 1 presents the historical records of annual catches and bycatches of pelagic armourhead by country, fishing gear and the SEAFO CA Division. The main fishing countries were:

  • · Russia that operated with bottom trawlers  in the late 1970s and 1993; 
  • · Ukraine (bottom trawl) fishing in the mid-1990s.
  • · Namibia  and South Africa ( bottom trawlers) in the mid-1990s;
  • · South Korea primarily operating with mid-water trawl in the period 2010-2013.

The higher annual catches were recorded by Russia with 1,273 and 1,000 t in 1977 and 1993, respectively, and by Korea with 688 t in 2010. Spain and Cyprus landed small catches in 2 and 1 years, respectively.

Table1:   Reported catches (tonnes) of pelagic armourhead(Pseudopentaceros richardsoni) from the SEAFO CA. Data reported by SEAFO CPs and other flag states reporting to SEAFO, and from FAO.

Nation

Namibia

Russia

Ukraine

Namibia

Fishing method

Bottom trawl

Bottom trawl

Bottom trawl

Bottom trawl

Management Area

B1

B1

UNK

C1

Year

Retained

Discarded

Retained

Discarded

Retained

Discarded

Retained

Discarded

1976

   

108

         

1977

   

1273

         

1978

   

53

         

1993

   

1000

 

435§

     

1994

               

1995

8

     

49

 

 

 

1996

284

     

281

 

 

 

1997

559

     

18

 

 

 

1998

--

             

1999

--

             

2000

20

             

2001

--

             

2002

--

             

2003

4

             

2004

 

             

2005

               

2006

               

2007

               

2008

               

2009

--

--

--

--

--

--

 

 

2010

--

--

--

--

--

--

 

 

2011

--

--

--

--

--

--

 

 

2012

--

--

--

--

--

--

 

 

2013

--

--

--

--

--

--

 

 

2014

--

--

--

--

--

--

 

 

2015

--

--

--

--

--

--

 

 

2016

--

--

--

--

--

--

 

 

  2017*

<1

0

--

--

--

--

<1

0

* Provisional (September 2017).
-- = No Fishing.Blank fields = No Data Available.
UNK = Unknown.
§ = Values from FAO

Spatial and temporal distribution of fishing

During the period from 2010 to 2013 Korean trawler vessels (Dongsan Ho and/or Adventure) conducted a targeted fishery for pelagic armourhead in the southern and northern parts of the Valdivia Bank, in Division B1 of the SEAFO CA (Figure 1-3). 

Figure 1:  Spatial distribution of fishing positions and reported catches of pelagic armourhead(P. richardsoni) aggregated to 10km diameter hexagonal cells, 2013

Figure 2:  Spatial distribution of fishing positions and reported catches of pelagic armourhead(P. richardsoni) aggregated to 10km diameter hexagonal cells, 2012

Figure 3:  Spatial distribution of fishing positions and reported catches of pelagic armourhead(P. richardsoni) aggregated to 10km diameter hexagonal cells, 2011

In 2017, only one vessel (trawler) from Namibia has conducted fishing activity in the SEAFO CA, targeting seamount species. Catches of pelagic armourhead took place in B1 and C0 (Fig. 4).

 

Figure 4: 2017 georeferenced fishing hauls and relative catches of pelagic Armourhead (P. richardsoni) aggregated by 10km diameter hexagonal cells. Upper map shows the single fishing position in B1 and the lower map the fishing position in C.