Physiological Studies on Cancer irroratus Larvae. I. Effects of Temperature and Salinlty on Survival, Development Rate and Size

Abstract

Larvae of the rock crab Cancer irroratus were found to b e eurythermal and stenohaline during development. Complete development occurred between 1 0 " and 24 "C in 30 960 S. Survival to the megalopa stage ranged from 20 % (at 10 'C) to 83 % (at 24 'C) Development was successful in 25, 30 and 35 %o S at 15 "C, but survival exceeded 50 % only in 30 and 35 460 S. Temperature and salinity significantly influenced molt frequency, intermolt duration and larval size. Maximum growth at metamorphosis was found at the mid-range of the thermal tolerance lini~ts (15O-18 'C). Comparison of these laboratory-determined data on survival and growth with available field data on the life history of C. irroratus suggests that the majority of larvae are released during that portion of the spawning period when larval wastage would be minimized and recruitment to the parental and regional populations would b e maximized.

Bioacumulation of trace elements in hepatic and renal tissues of the white mullet Mugil curema Valenciennes, 1836 (Actinopterygii, Mugilidae) in two coastal systems in southeastern Brazil

“…Therefore, our results indicated that 1.6 mg/L NO 2 -N produces physiological stress, which cause changes in excretion patterns. The same was shown for larvae of the shrimp, Palaemon serratus, subjected to stress of temperature and salinity (Yagi et al 1990), and larvae of the crab, Cancer irroratus, (Johns 1981) and lobster, Homarus americanus, larvae (Capuzzo and Lacaster 1979) exposed to unfavorable temperatures.…”

Laboratory cultivation and experimental studies of salinity effects on larval development in the African River prawnMacrobrachiumvollenhovenii(Decapoda, Palaemonidae)

“…1979: Johns. 1981 In As pre-moult and post-moult lengths could not be determined for the individually kept larvae.…”

La temperatura como factor de variabilidad en el desarrollo y morfología de larvas zoeas de Acanthocyclus hassleri Rathbun (Decapoda, Brachyura, Atelecyclidae) cultivadas en laboratorio

“…En crustáceos decápodos se ha evaluado el efecto de diferentes regímenes térmicos sobre la sobrevivencia y el tiempo de desarrollo larval (Anger, 1983;Minagawa, 1990;Anger et al, 2003); así como también sobre aspectos fisiológicos y metabolismo larval (Johns, 1981;Laughlin & Neef;Anger et al, 1981;Ismael et al, 1997). Sin embargo, existen muy pocos trabajos que evalúen la variabilidad morfológica larvaria de crustáceos decápodos, como mecanismo de respuesta adaptativa al régimen térmico.…”