1. Mackerel egg development was followed to hatching at constant temperatures of 10 degrees , 11 degrees , 12 degrees , 13 degrees , 14 degrees , 15 degrees , 16 degrees , 17 degrees , 18 degrees , 19 degrees , 20 degrees , 21 degrees , 22 degrees , and 24 degrees C. Experiment showed that typical development could be realized only between 11 degrees and 21 degrees . 2. The length of the develo...

A female of the terrestrial crab Sesarma haematoeheir incubates 30,000-50,000 eggs on her abdomen. After 1 month of embryonic development, zoeae larvae are released into estuarine waters within 3-5 sec by means ofvigorous fanning motions of the abdomen. Hatching (breakage of the outer egg membrane) occurs on land just before larval release. The release behavior itself does not cause rupture of ...

The identification of novel targets for controlling the sheep blowfly is an important process for discovering new generation compounds that are safer and more environmentally friendly. Experiments in our laboratory have indicated a role for serine proteases in influencing egg hatching in the sheep blowfly. Isolation of the proteases involved using benzamidine affinity chromatography identified ...

Giant liposomes are proposed as a potential delivery system in marine copepods, the dominant constituent of the zooplankton. Liposomes were prepared in the same size range as the food ingested by copepods (mean diameter of about 7 microm). The encapsulation of a hydrophilic and high molecular mass fluorescent compound, fluorescein isothiocyanate-dextran (FitcDx), within the liposomes provided a...

The natural estrogen 17 -estradiol (E2) is responsible for the endocrine disruption and also has potential effect on the reproduction of vertebrate. However, its effect on invertebrate reproduction has scarcely been studied. The present study was conducted to determine the effect of E2 on survival, egg production and egg hatch of calanoid copepod, Acartia omorii under bath administration. Survi...

—Three trials were conducted to evaluate the effect of hydrogen peroxide (H2O2) treatment on the hatching success of channel catfish Ictalurus punctatus when administered during egg incubation as a 15-min bath or as a flow-through treatment. In the first trial, initial treatment with 100 mg povidone iodine/L followed by daily 15-min baths of 250 mg H2O2/L yielded a 26% increase (P , 0.05) in ha...

Carp eggs were exposed immediately after fertilization to Cu concentrations of 0.3 and 0,8 (xmol/L at water pH 7.6 or pH 6.3. Mortality, the incidence of spina! cord deformation, heart rate, tail movements, hatching success, and whole-body content of K, Na, Mg, Ca, and Cu were determined over time. Light microscopical preparations of eggs (48 h after fertilization) and larvae (168 h after ferti...

Carp eggs were exposed immediately after fertilization to Cu concentrations of 0.3 and 0,8 (xmol/L at water pH 7.6 or pH 6.3. Mortality, the incidence of spina! cord deformation, heart rate, tail movements, hatching success, and whole-body content of K, Na, Mg, Ca, and Cu were determined over time. Light microscopical preparations of eggs (48 h after fertilization) and larvae (168 h after ferti...

Carp eggs were exposed immediately after fertilization to Cu concentrations of 0.3 and 0,8 (xmol/L at water pH 7.6 or pH 6.3. Mortality, the incidence of spina! cord deformation, heart rate, tail movements, hatching success, and whole-body content of K, Na, Mg, Ca, and Cu were determined over time. Light microscopical preparations of eggs (48 h after fertilization) and larvae (168 h after ferti...

Carp eggs were exposed immediately after fertilization to Cu concentrations of 0.3 and 0,8 (xmol/L at water pH 7.6 or pH 6.3. Mortality, the incidence of spina! cord deformation, heart rate, tail movements, hatching success, and whole-body content of K, Na, Mg, Ca, and Cu were determined over time. Light microscopical preparations of eggs (48 h after fertilization) and larvae (168 h after ferti...