Distribution, development, and metabolism of larval stages of the warmwater shrimp,Caridina babaulti basrensis(Decapoda, Atyidae)

Abstract

Peak release of zoea I larvae of the warmwater shrimp, Caridina babaulti basrensis (Al-Adhub AHY 1987) in the field coincided with the highest summer water temperature (33 C). Zoea I abundances did not correlate significantly with the phase of the lunar cycle ( p ¼ 0.256) and only slightly with time of day (day : night regimes, p ¼ 0.079). Temperature correlated significantly with zoeae I larval release in the field ( p < 0.0001). Development and respiration were measured at constant water temperatures ranging from 20 to 35 C in coordination with the temporal distribution of larvae in the field. Cumulative duration for the development of the larval phase of C. babaulti basrensis was 11.4, 7.7, and 6.1 days at 25, 30, and 35 C, respectively. Larvae were unable to complete development at 20 C. Respiration rate for larval C. babaulti basrensis increased in direct proportion to temperature, and revealed metabolic stress at high temperatures. Laboratory rearing supported field data, which indicated a constraint on the presence of stage I zoeae in the plankton at lower temperatures (20 C). Although some larval stages may be metabolically stressed at higher temperatures, rapid development rates accomplished at higher temperatures may be a likely mechanism for retention within the habitat and recruitment to the adult population.

Oxygen consumption and energy budget of the barnacle Balanus amphitrite amphitrite (Darwin, 1854) in an estuarine ecosystem, Basrah-Iraq

“…The relation of the rate of O2 consumption of the barnacle B.a.amphitrite follow the normal pattern of increase with increasing temperature and body weight, and this concur with the results of Dame (1976); Al-Dabbagh and Marina (1986); Idrisi and Salman (2005); Abdullah (1996) The present results showed that the b values of the relationships of metabolism at 15, 23 and 30 °C were -0.623,-0.676 and -0.520, respectively which are lower than the b value of B. balanoides (-0.77) at 15 °C (Newell and Northeroft ,1967), and more than those of B. balanoides and B. balanus reported by Barnes and Barnes (1969) (-0.388 at 15 °C and -0.327 at 20 °C for the former and -0.4204 at 15 °C and -0.2145 at 20 °C, for the latter). Moreover, the present results indicate that B.a.…”

Population biology and sexual dimorphism in the freshwater prawn Atya scabra (Decapoda: Atyidae) in the De Contas River, Bahia, Brazil

“…Almeida et al (2010) also collected ovigerous females of Atya scabra throughout the entire year, characterizing the reproduction as continuous. The breeding period in the Atyidae family demonstrated to be continuous in many studies (Benzie & De Silva, 1988;De Silva, 1990;Idrisi & Salman, 2005;Leuven, Van Der Brink, & Van Der Velde, 2008). It is possible that the rainy season is able to influence peaks (Hoarau, 2018;Hoffman & Negreiros-Fransozo, 2010).…”