Growth and Reproductive Biology of the Freshwater Shrimp Exopalaemon Modestus (Decapoda: Palaemonidae) in a Lake of Korea

Status of the Siberian Prawn, Exopalaemon modestus, in the San Francisco Estuary

“…This shrimp was also slightly larger than the maximum size of 76 mm TL from the Columbia River (Emmett et al 2002). Female E. modestus were larger than males, consistent with the finding from Korea (Oh et al 2002) that females grew faster and reached a larger size than males. E. modestus has also been documented as a prey item for several larger fishes in the estuary, particularly striped bass Feyrer 2007, 2008).…”

“…The largest specimen collected, an 82-mm female, was 22 mm larger than the maximum size given by Holthius (1980) but very close to the largest female reported by Oh et al (2002) from its native range.…”

“…The peak of the season is in late spring and summer, as indicated by increased catches of ovigerous females, and the dominance of the current year class in August. In Korea, the reproductive season is shorter, with ovigerous females present from May through September, but there are multiple broods, and females are able to reproduce continually throughout the breeding season (Oh et al 2002).…”

“…E. modestus has also been documented as a prey item for several larger fishes in the estuary, particularly striped bass Feyrer 2007, 2008). Palaemonid shrimp such as E. modestus play an important role in aquatic ecosystems, serving as both predators of meiofauna and prey for fish (Oh and Park 2000;Oh et al 2002). In the estuary, the introduced P. macrodactylus preys primarily upon crustaceans, including mysid shrimp, amphipods, and copepods (Sitts and Knight 1979;Siegfried 1982).…”

Crescimento de Aegla manuinflata (Decapoda, Anomura, Aeglidae) em ambiente natural

“…Existem informações significativas sobre o crescimento de Decapoda de águas continentais, destacando-se os trabalhos com Palaemonidae (valenti et al, 1987, 1993, 1994Souza & fontoura, 1995;oH et al, 2002;Cartaxana, 2003) BondBuckup & Buckup, 1994noro & BuCkuP, 2003;silva-Castiglioni et al, 2006e Boss Jr. et al, 2006 O crescimento em comprimento de A. manuinflata foi analisado com base na distribuição de frequências absolutas em intervalos de classe de tamanho de 2 mm de CC, que corresponde à quarta parte do desvio padrão da média calculada para o total da amostra examinada (Markus, 1971). Os organismos com menos de três milímetros de comprimento não apresentavam pleópodos e os poros genitais eram difíceis de serem visualizados, o que impossibilitava uma sexagem segura; neste sentido, foram somados ao conjunto de ambos os sexos na análise da distribuição de frequência em classes de tamanho.…”