Research assessment for the management of the industrial shallow-water multi-species shrimp fishery in Sofala Bank in Mozambique

Enhancing fishery assessments for an Australian abalone fishery using commercial weight-grade data

“…Estimates of the maximum number of greenlip harvested, and their minimum mean weight, were equally informative because they also showed substantial changes through time. While measures of mean weight have the potential to be highly informative (McGarvey and Matthews, 2001), and have been used to aid assessment of selected lobster and prawn stocks (Campbell, 1992;De Sousa et al, 2006;Linnane et al, 2009), their use is seemingly rare. In concert with total catch, estimates of the number of individuals harvested provide another, direct measure of resource extraction.…”

Modelling the tides and their impacts on the vertical stratification over the Sofala Bank, Mozambique

“…The Sofala Bank has been studied in the past in terms of marine biology (Gammelsrod 1992;Sousa et al 2006;Leal et al 2009). However, tidal characteristics and their influence on mean water properties remain poorly investigated.…”

“…It has an average depth of about 30 m and is approximately 150 km wide and 500 km long. The bank hosts an important shrimp fishery dominated by two species, Penaeus indicus and Metapenaeus monoceros (Sousa et al 2006). According to Gammelsrod (1992), these species comprised 48% of shrimp catches on the bank in the early 1990s.…”

“…According to Gammelsrod (1992), these species comprised 48% of shrimp catches on the bank in the early 1990s. From 2000 to 2002, the annual average industrial shrimp catch was 8 600 t, with P. indicus and M. monoceros accounting for 4 600 t and 2 500 t, respectively (Sousa et al 2006).…”

“…Several studies related to the shrimp fishery have been conducted on the bank (Gammelsrod 1992;Sousa et al 2006;Fennessy and Isaksen 2007), but tidal characteristics, and particularly the effects of tides on the vertical stratification and the mean ocean circulation on the bank, remain poorly understood. In this context, a three-dimensional numerical model has been designed to resolve the tides on the bank and their effects on the vertical oceanic structure.…”