Last updated on 29 August 2016
No formal stock assessments are conducted. Biomass is estimated in the major bays using a “sweep area method” (Brown 2011). Last biomass evaluations were conducted in 2008 assessment in ‘Isla Lobos de Tierra’, in 2010 at ‘Sechura’ Bay (IMARPE 2010) and in 2012 at ‘Independencia’ Bay (Galindo et al. 2013). No survey strategy is defined to assess all beds at the national level but in 2011 a technical-scientific protocol was defined by IMARPE to properly assess populations (Argüelles et al. 2011).
Last updated on 3 August 2016
Scientific advice is provided by the Peruvian Sea Institute (IMARPE). The biomass in the major bays is estimated annually by IMARPE, although detailed information on the evaluations is not publicly available. There may be temporary moratoriums when scallop abundance is considered to be very low (Mendo et al. 2008).
A management plan, including all stakeholders in the area, was proposed by Mendo (undated) for ‘Isla Lobos de Tierra’. The same author also recommends the revision of the minimum landing size to 90 mm. Natural beds are subject to extraction for aquaculture (grow-out for seeds or juveniles) so the management is essential to guarantee the sustainability of the resource (Mendo, undated). Wolff and Mendo (2000) demonstrated the importance of a national strategy to manage scallop beds along the Peruvian coast and relation among beds.
Last updated on 03 Aug 2016
No reference points have been defined yet.
Last updated on 29 August 2016
The current stock status of Peruvian calico scallop in Perú Peru is unknown. Although the stock has been categorized as fully fished in the past, this information is old (1996). Total landings decreased to 39,680 tons in 2012 at the national level (Mendo et al. 2008; Cacho et al. 2013).
Last updated on 29 Aug 2016
There is some information on biomass assessments from some fishing areas:
- 2008 assessment in ‘Isla Lobos de Tierra’ concluded that biomass was at 1494,400 tons, mainly of organisms with <65mm. Recruitment has been variable since 1995 and landings attained 3,000 tons in 1997 and reduced in the following years, only increasing during 2002-2004 to around 0,500 t (Mendo, undated).
- In ‘Sechura’ bay, biomass has been increasing since 2006 and was estimated at 52,567 tons in 2009, the highest level of the time series; decreased in 2010 to 35,823 t. Although, this high is likely to result from restocking efforts rather than from a “natural recovery” of the stock (IMARPE 2009; Brown 2011). Landings have increased sharply in recent years, from 4,099 t in 2004 to 97,466 t in 2010 (IMARPE, 2010).
- Natural bed in ‘Independencia’ Bay are considered to be overexploited, with biomass at 422,514 tons, and with no signs of recovery despite the increase in landings 2002-2011. Low density levels are result of high extraction in previous years (Galindo et al. 2013).
Landings trends are in close relationship with environmental variables, especially El Niño (Wolff and Mendo 2000; Wolff et al. 2007; Mendo et al.,2008; Hunt 2010). Maximum highs were attained in 1985 with 47,640 tons and in 1999 with around 30,000 tons; between these years, landings were at around 5,000 tons, on average. From 2001 rose progressively, reaching almost 93,000 tons in 2011 (Mendo et al. 2008; Cacho et al. 2013).