Egg Development and Larvae and Juveniles Morphology of Carp, Cyprinus carpio in Korean

Abstract

This study was conducted to observe egg and larvae morphological development of carp to obtain basic data for resource conservation and taxonomic research. Brood carp used in the research (total length 67.3-75.5 cm, average 71.0±3.45 cm) were bred in a circular rearing aquarium (600×300×100 cm) using a running water system from January to July, 2015. Breeding water temperature was maintained at 23.0-25.0℃(average 24.0℃). Fertilized carp eggs were translucent and globular, and their size was 1.75-1.89 mm (average 1.82±0.06 mm). Blastoderms formed 10 min after fertilization and reached the two-cell stage 30 min after fertilization. Then, the embryo turned dark and exhibited melanophores, and blood started flowing from the heart across the egg yolk at 42 hrs and 50 min after fertilization. Hatching began 70 hrs and 26 min after fertilization larvae emerged through the egg membrane, starting from the head. The length of prelarvae immediately after hatching was 5.23-5.38 mm (average 5.31±0.11 mm) the mouth and anus were closed, and the pectoral fin was formed. Postlarvae at 18 days after hatching had a total length of 11.9-13.9 mm (average 12.9±1.40 mm), separate anal fin and back membranes, and fin ray. Juveniles fish at 35 days after hatching had a total length of 29.9-30.2 mm (average 30.1±0.13 mm), with the body covered with scales, and the same number of fin rays, color, and shape as their broodstork.

Biomarkers for the toxicity of sublethal concentrations of triclosan to the early life stages of carps

“…In the present experiment whole body surface of hatchlings was in direct contact of the contaminated water because it was devoid of scales. The scales develop 20 days post hatching 33,34 and protect the skin from predators, parasites and pollutants in the surrounding environment. This gets support from Escarrone et al 35 , who observed that accumulation of TCS in different tissues of Poecilia vivipara reached a steady state after one week of exposure in most of the tissues except for gill (having large surface area in direct contact with the pollutant) and gonad (having large lipid content).…”

Artificial reproduction of royal carp (Cyprinus carpio)

“…The first few hours after hatching, the larvae feed on their yolk and swim vertically to fill the swim bladder and become able to swim horizontally. The larval phase is a delicate and crucial stage of fish rearing (Park et al, 2017). During this phase, feeding plays an important role on the development of the larvae, including the development of the skeletal system.…”