Selected morphological changes in Artemia franciscana after ionizing radiation exposure

Area of Science:

• Marine Biology
• Radiation Biology
• Crustacean Physiology

Background:

• Artemia franciscana, commonly known as brine shrimp, are vital in aquatic ecosystems and aquaculture.
• Understanding the effects of ionizing radiation on aquatic invertebrates is crucial for environmental impact assessments.
• Morphological parameters can serve as sensitive indicators of biological stress.

Purpose of the Study:

• To investigate the impact of gamma irradiation on the morphometric characteristics of Artemia franciscana nauplii.
• To identify key dimensional ratios that correlate with radiation dose.
• To establish a basis for using morphological changes as biomarkers for radiation exposure in crustaceans.

Main Methods:

• Nauplii of Artemia franciscana were exposed to varying doses of gamma radiation (0.25, 0.5, 1.0, and 2.5 kGy).
• Morphological measurements including body length, body width, intestine width, intestine epithelium width, and intestine lumen width were recorded for 126 specimens.
• Ratios of these dimensions were calculated and analyzed to assess dose-dependent effects.

Main Results:

• Significant dose-dependent changes in body length/body width ratio were observed (e.g., 3.45-3.98 at highest doses vs. 4.13 in controls).
• The intestine epithelium width/intestine lumen width ratio showed a marked decrease with increasing radiation dose (e.g., 0.45-0.64 at highest doses vs. 0.85 in controls).
• These specific dimensional ratios proved to be the most sensitive indicators of radiation-induced morphological alterations.

Conclusions:

• Gamma irradiation induces measurable morphological changes in Artemia franciscana nauplii.
• The body length/body width and intestine epithelium width/intestine lumen width ratios are reliable biomarkers for assessing radiation effects in this species.
• This study provides quantitative data on radiation sensitivity and morphological responses in a key aquaculture species.