Three stage potassium vapor turbine test

Three-stage potassium vapor turbine test to determine effects of vapor wetness on impingement damage of different rotor blade material

A list of the TACs and TABs required as output from OMP-12

A revision of the TACs and TABs output from the joint sardine and anchovy OMP is required. This is firstly to account for a change in the specification of bycatch in the landings from 2011 (de Goede 2011) and secondly to make allowance for some landings which have historically been ignored as they have not been landed under a permit. This document lists the TACs and TABs that were recommended by OMP-08 and those to be recommended by OMP-12 and makes some suggestions for how the new TAC/Bs to be recommended by OMP-12 will be calculated

Testing robustness of the two mixing stock hypothesis for South African sardine to parasite prevalence data between 20 and 22 degrees

The baseline two mixing stock assessment of South African sardine has been conditioned on parasite prevalence data on the south coast east of 22◦E only (Dunn et al. 2015, de Moor and Butterworth 2016). Data between 20 and 22◦E were excluded from the baseline assessment to ensure no age-1 sardine from the west stock that were not permanently moving to the south stock were included in south stock prevalence data. This document explores the sensitivity of the assessment results to including the parasite prevalence data between 20 and 22◦E

OMP-14: Alternative initial directed sardine TAC Rules

The latest Candidate Management Procedure (CMP) proposed to be used as the next Operational Management Procedure (OMP) for the South African sardine and anchovy fishery, OMP-14, is detailed in the Appendix. The Small Pelagic Scientific Working Group has previously agreed the form of the rule governing the increase in the directed sardine TAC in cases where the November survey estimate of 1+ biomass is between 300 and 600 000t, and only a portion of the original TAC is recommended at the start of the year. The OMP Task Team agreed in September 2014 that the increase would continue to be dependent on the historical observed 1985-2011 average of 13.74 billion, with a critical value of Rcrit = 2.1 × Avg rec = 48.16 billion. This document shows the results of assuming different alternatives to the rule governing the portion of the directed sardine TAC recommended at the start of the year in cases where the November survey estimate of 1+ biomass is between 300 and 600 000t. In addition, the maximum possible increase is now smoothed from 110% of the original TAC at 300 000t, to 100% of the original TAC at 600 000t. All results in this document are based on a single sardine stock operating model

Were the survey observations of anchovy during 2011 outside the range simulated during OMP-08 development

At the Small Pelagic Scientific Working Group Meeting on 29th February 2012, some queried whether the below average survey observations of anchovy during 2011 warranted a change to the TAC constraints used in OMP-08. This was considered under the general protocol for OMPs for South African fisheries which cater for unanticipated events and can lead to the initiation of a review of an OMP ahead of the schedule (see Appendix 2 of Rademeyer et al. 2008). In this document, a simple check is performed to evaluate whether the 2011 survey estimates of anchovy abundance were outside the major part of the range (typically to 90% or 95% PI would be the norm) simulated during the testing of OMP-08

The projected range of total sardine biomass

Figure 1 shows the histogram of the projected range of future hydroacoustic survey estimates of sardine 1+ biomass that were simulated during the testing of OMP-08 (de Moor and Butterworth 2008) and Interim OMP-13 v2 (de Moor and Butterworth 2013). Assuming a single sardine stock hypothesis, the cumulative simulated probability of obtaining a survey estimate of sardine 1+ biomass of less than 750 thousand tons was simulated to be 21% under OMP-08 and 29% under Interim OMP-13 v2. Assuming a two sardine stock hypothesis, the cumulative probability of obtaining a survey estimate of sardine 1+ biomass of less than 750 thousand tons was simulated to be 86-87% under “MoveE1 ” and “MoveB2 ” and 24% under “NoMove3 ”

Comparisons of alternative single-area sardine TAC Management procedures

The Small Pelagic Scientific Working Group has requested further testing of Candidate Management Procedures allocating a single-area sardine Total Allowable Catch (TAC) for possible update of Interim OMP-13 v2 for use in setting the 2014 initial sardine and anchovy TACs and Total Allowable Bycatches (TABs). This is planned as a temporary measure, while further testing continues in comparing Candidate MPs which allocate a single-area sardine TAC to those which allocate a two-area sardine TAC

An alternative two mixing stock hypothesis for South African sardine

The results of the two mixing stock hypothesis for South African sardine presented in de Moor and Butterworth (2016) assumed recruitment to each coastal management unit was dependent only on the spawner biomass (SSB) of that coastal management unit. In this document some contribution from the south coast SSB to the effective west coast SSB is considered as an alternative two mixing stock hypothesis