Reproduction and population dynamics of the temperate freshwater shrimp, Neocaridina denticulata denticulata (De Haan, 1844), in a Korean stream

Abstract

Seasonal changes in population structure, reproductive activity, and growth of the shrimp Neocaridina denticulata denticulata were examined in a Korean stream between July 1999 and June 2001. Average population density ranged from 34 to 180 indiv. m ¡2 ; density declined during the rainy season as the population dispersed into freshly inundated areas. The main breeding season, from June to July, coincided with higher gonadosomatic indices. Within this season ovaries rematured during embryonic development, indicating a potential for multiple ovulations within the reproductive season. Egg batch weight averaged 44% of female weight, indicating a greater investment in egg production than reported in other freshwater and marine shrimps.The carapace length at which 50% of females were mature was estimated as 6.4 mm from the proportion of females with mature ovaries, and as 7.8 mm from the proportion of ovigerous females. Estimates using the modi ed Von Bertalanffy growth function (VBGF) incorporating seasonal oscillation in growth showed that females (L1 D 12:50 mm CL, K D 0:59 year ¡1 , Á 0 D 1:96) grew faster, and reached a larger size at age, than males (L1 D 9:35 mm CL, K D 0:93 year ¡1 , Á 0 D 1:91). RÉSUMÉLes variations saisonnières de la structure de la population, de l'activité reproductrice, et de la croissance chez la crevette Neocaridina denticulata denticulata ont été examinées dans une rivière coréenne de juillet 1999 à juin 2001. La densité de population moyenne allait de 34 à 180 indiv. m ¡2 ; la densité diminuait au cours de la saison humide quand la population était dispersée dans les eaux fraîchement inondées. La principale saison de reproduction, de juin à juillet, coincidait avec des indices gonadosomatiques plus élevés. Au cours de cette saison, les ovaires redevenaient matures 5 / Crustaceana 76 (8): 993-1015 Also available online: www.brill.nl 994 CHUL-WOONG OH ET AL.au cours du développement embryonnaire, indiquant un potentiel pour des ovulations multiples durant cette même saison. Le poids des oeufs représentait 44% du poids de la femelle, indiquant un investissement plus grand dans la production des oeufs que chez d'autres crevettes marines et d'eaux douces.La longueur de la carapace à laquelle 50% des femelles sont matures a été estimée à 6,4 mm en considérant la proportion de femelles à ovaires matures, et à 7,8 mm en considérant la proportion de femelles ovigères. Les estimations utilisant la formule modi ée de Von Bertalanffy (VBGF) qui incorpore l'oscillation saisonnière dans la croissance ont montré que les femelles (L 1 D 12;50 mm CL, K D 0;59 an ¡1 , Á 0 D 1;96) croissaient plus vite, et atteignaient une taille supérieure à celle des mâles au même âge (L 1 D 9;35 mm CL, K D 0;93 an ¡1 , Á 0 D 1;91/.

Life history of an invasive freshwater shrimp <i>Neocaridina davidi</i> (Bouvier, 1904), (Decapoda: Caridea: Atyidae) in the Tomoe River, the Boso Peninsula, eastern Japan

“…Comparisons between the life history of N. davidi in the Tomoe River and that of N. denticulata as reported in previous studies (Ogawa et al, 1987;Niwa and Hamano, 1990;Sato et al, 1994;Oh et al, 2003) are presented in Table 1. Overall, the life history of N. davidi in the present study is quite similar to that of N. denticulata reported in previous studies.…”

“…Both Neocaridina denticulata and N. davidi inhabited rivers mid-stream, lakes, marshes, and irrigation canals where emergent plants were abundant (Kamita, 1970;Ogawa et al, 1987;Sato et al, 1994;Suzuki & Sato, 1994;Englund & Cai, 1999;Oh et al, 2003;Liang, 2004;Hayashi, 2007;Suzuki & Naruse, 2011;Toyota & Seki, 2014). This sympatry potentially leads to competition between the two species for habitat.…”

“…In contrast, the life history of N. denticulata was investigated by several studies, with some studies reporting that the life span of this species was 11-16 months (Ogawa et al, 1987;Sato et al, 1994;Oh et al, 2003). Niwa and Hamano (1990) recognized two life history groups from the same study area.…”

Life history traits of the invasive estuarine shrimp <i>Palaemon macrodactylus</i> (Caridea: Palaemonidae) in a marine environment (Mar del Plata, Argentina)

“…In addition, during the breeding period, females that carry eggs cannot moult and therefore growth is inhibited (Oh et al 2003). Nevertheless, the growth of both males and females of P. macrodactylus was seasonal, started in September and finished in April, in accordance with the reproductive season.…”

Occurrence and distribution of freshwater shrimp in the Isazu and Yura Rivers, Kyoto, western Japan

“…Stations where no shrimp were caught were excluded from the comparison. The growth of the shrimp in this period was considered to be negligible, because several previous studies have shown that atyid shrimp show low or no growth at low temperatures (approximately 10°C; see, for example, Oh et al 2003, Yamahira et al 2007. A Wilcoxon Mann-Whitney rank sum test was used for data analyses using R version 2.14.1 (R Development Core Team 2011) and coin package for R (Hothorn et al 2006).…”