Does the upwelling phenomenon influence the population dynamics and management of the seabob shrimp Xiphopenaeus kroyeri (Heller, 1862) (Crustacea, Penaeidae)?

Abstract

The seabob shrimp Xiphopenaeus kroyeri ranks third in commercial importance among fisheries in southeastern Brazil. An important management question is whether the same offseason can be applied to different regions. The population dynamics of the seabob shrimp was compared in two regions of southeastern Brazil: Macaé, state of Rio de Janeiro and Ubatuba, state of São Paulo. All demographic categories of shrimp in the Macaé region were larger than those in the Ubatuba region. Lower temperatures and greater longevities in the Macaé region may account for this difference in size from Ubatuba. In Macaé, number of reproductive females and juveniles correlated with organic-matter content. In Ubatuba, only chlorophyll-a showed a correlation with reproductive females. The reproductive period and recruitment were correlated in both populations. The difference in environmental factors between these regions, resulting of the Cabo Frio upwelling, although they are located close together, directly influences the population dynamics of X. kroyeri. The Cabo Frio upwelling may be acting as a physical barrier, preventing gene flow and differentiating the seabob shrimp stocks in the two regions. These data suggest that different offseason periods for different regions could increase the sustainability of shrimp harvesting along the Brazilian coast.

The Cabo Frio upwelling overrides geographical patterns in the population dynamics of the shrimp Artemesia longinaris Spence Bate, 1888 (Decapoda: Penaeidae)

“…The results presented here indicate that the upwelling of Cabo Frio is likely the key factor in determining differences in the population dynamics of A. longinaris between the two regions studied, as was previously observed for X. kroyeri (Davanso, Hirose, Herrera, Fransozo, & Costa, ). Although the reproductive biology in both regions followed the typical pattern for the latitude range, the size at sexual maturity, the maximum size of individuals, the longevity, and the growth rate showed a pattern opposite to that expected for the latitude of Macaé, more similar to patterns observed in temperate regions than to those seen in Ubatuba.…”

Growth parameters, longevity, and mortality of the seabob shrimp Xiphopenaeus spp. (Decapoda: Penaeidae) in four important fishing regions of southeastern Brazil

“…All these local characteristics directly influence the population structure of shrimp (Herrera et al, 2017; Pantaleão et al, 2016; Silva et al, 2014). As indicated in the present study and corroborated by results found by Davanso et al (2017) for the same taxon, shrimp in this region reach larger sizes, grow slower, and live longer than those from other regions studied, highlighting subtropical/temperate characteristics in Macaé. Similar results have been reported for Pleoticus muelleri (Spence Bate, 1888) (Sancinetti et al, 2019), Artemesia longinaris Spence Bate, 1888 (Carvalho‐Batista, Pantaleão, et al, 2019), and Exhippolysmata oplophoroides (Holthuis, 1948) (Pescinelli et al, 2018).…”

“…However, the offseason period in the Southeastern and Southern regions was designed to protect juvenile pink shrimp ( Farfantepenaeus spp.) Several studies indicate that this period is not adequate for Xiphopenaeus spp., reinforcing the importance of adjustments, such as including February in the offseason period to reduce fishing pressure on this important resource (Castilho et al, 2015; Davanso et al, 2017; Fernandes et al, 2014; Heckler et al, 2013). In addition, the development of environmental education programs in fishing regions is fundamental to strengthen relationships between people and marine ecosystems.…”

The hermit crab–shell relationship through the lens of interaction networks: The use of network metrics and species role across communities

“…Maca e region was sampled monthly from July 2010 to June 2011 in three transects from 5 to 15 m deep, this region characterised by an upwelling (for more information on samplings at Maca e please see Costa et al 2016). Ubatuba region was sampled monthly from July 2010 to June 2011 from 5 to 15 m deep, this region is at a latitude of 23°S, which make this area a faunal transition zone between two zoogeographic provinces (Boschi 2000) (for more information on samplings at Ubatuba please see Davanso et al 2017). Canan eia region samples were conducted monthly from July 2012 to May 2014 from 5 to 15 m deep (for more information on samplings at Cananeia please see Garcia et al 2016).…”