Abstract
We examined the morphology of fertilized egg and ultrastructures of fertilized egg envelopes of Ancistrus cirrhosus belong to Loricariidae using light and electron microscopes. The fertilized eggs formed a mass on the spawning place and were yellowish, spherical, non-transparent, demersal, adhesive, and a narrow perivitelline space. But, the adhesiveness of fertilized eggs was disappeared after spawning excluding contact parts. The micropyle with funnel shape was surrounded by 15–19 furrow lines of egg envelope in a spoke-like pattern. The outer surface of egg envelope has smooth side and inner surface of egg envelope was rough with grooves. Also, the total thickness of the fertilized egg envelope was about 32.58 ± 0.85 μm (n = 20), and the fertilized egg envelope consisted of three layers, an outer adhesive electron-dense layer, a middle layer with low electron density and an inner electron-dense layer with grooves in counter structure from other most teleost. Collectively, these morphological characteristics and adhesive property of fertilized egg, and ultrastructures of micropyle, outer surface, and section of fertilized egg envelope are showed species specificity.
Highlights
Jumbie teta (Ancistrus cirrhosus Valenciennes, 1836) is a teleost belong to Loricariidae, Siluriformes, and Actinopterygii
We studied the morphology of fertilized egg, and the ultrastructures of micropyle, outer surface, inner surface and section of fertilized egg envelopes under the light and electron microscopes to find out species specificity in Jumbie teta, Ancistrus cirrhosus belong to Loricariidae, Siluriformes, and Actinopterygii with special spawning behavior
Morphology of fertilized eggs The fertilized eggs formed a mass on the spawning place
Summary
Jumbie teta (Ancistrus cirrhosus Valenciennes, 1836) is a teleost belong to Loricariidae, Siluriformes, and Actinopterygii. This species inhabits in Parana River basin of Argentina and Uruguay and algae-eater (Fishbase contributors 2020). A male guard eggs and larvae for up to 10 days after hatching in a cavity nest. It is known to female Ancistrus preferentially spawn with males guarding larvae, and the male’s snout tentacles stimulate this bias by mimicking the presence of larvae in an otherwise empty nest (Sabaj et al 1999). The egg envelope plays a role in diffusive exchanges of gases such as O2 and CO2, selective transport of necessary materials into the egg, protection of providing physical impact, chemicals and pathogens, fixation to a spawning ground in case of adhesive type, and inhibition of polyspermy through micropyle, sperm entry part (Grierson and Neville 1981; Laale 1980; Harvey et al 1983; Cameron and Hunter 1984)
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