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The egg-carrying copepod Eurytemora affinis IS cles and detntus are often found in high concentrations often a characteristic and dominant component in the carbon cycles of freshwater influenced marine ecosystems in the Northern Hemisphere. In egg-carrying copepods the specific egg produclion rate in the field can be calculated from the egg hatching rate at in situ temperatures, the eggliemale ratio and the carbon content of the eggs and females. To determine the temperature dependent egg hatching time (HT) of 2 populations of E. affinis, hatching experiments were conducted at 6 different temperatures (T). Hatching times ranged from 14.1 to 1.6 d at 5 and 22"C, respectively. Results from the 2 populations were pooled and fitted to a power functionHT = 187T ' 5 4 (I-' = 0.97; p < 0.001). There is a large range in the hdtch~ng t~rnes versus temperature reported In the 11tei-ature, dnd our results reveal longer hatching times than prev~ously reported To overcome this pronounced vanation in hatching tlmes, we present a significant relationship (r2 = 0.87; p < 0 001) based on all available data: HT = 36.87 'l'' in estuaries, E. affinis potentially plays an important role in trophic dynamics, making these carbon sources available for higher trophic levels. The consumption rate and production of copepod populations can be estimated from measurements of the weight-specific egg production rate and the standing stock (Kiarboe et al. 1985a, b). This method assumes equal weight-specific growth rates in all stages and a close correlation between ingestion and egg production (Kiorboe et al. 1985a, b, Berggreen et al. 1988, Fryd et al. 1991). Egg production rates of free-spawning copepod species are determined by incubation of adult females under in situ conditions as described by Kimboe et al. (1985a, b). However, this method cannot be implemented directly to egg-carrying copepods,

Hatching rate of the egg-carrying estuarine copepod Eurytemora affinis