Metrics details. Species belonging to the genus Lernaea are cosmopolitan parasites that can infect many different freshwater fish hosts. Due to a high degree of morphological intraspecific variability and high levels of interspecific similarities, their classification is extremely difficult and controversial. Although the suitability of the shape of cephalic horns has been questioned decades ago by some experimental infection studies, this character still plays the central role in the identification of Lernaea spp. We used the nominal species Lernaea cyprinacea and Lernaea cruciata to test the hypothesis that the shape of the anchor can exhibit host-induced morphological variability, and that the two taxa may be synonymous. We examined wild or farmed specimens of five host fish species four cyprinids and a mosquitofish , and found that all 16 parasite specimens collected from mosquitofish could be morphologically identified as L.
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The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report. The adult female Lernaea cyprinacea has a small semispherical cephalothorax, which contains the mouth. Behind it is a well-developed holdfast, normally consisting of two bifurcate dorsal processes and two simple ventral processes Fig.
The elongate neck and trunk carry the four pairs of legs of the premetamorphosed female. The abdomen is short. In situ , the holdfast and part of the trunk are buried in the host while most of the trunk and the abdomen project into the water Fig. Lernaea spp. A and B.
Lernaea cyprinacea. Diagram of adult female in situ. The naupliar stages are non-feeding and moult to infective copepodids in about 4 days. Copepodids are usually on the gills and are relatively immobile, although they are not permanently attached. Adult males die within 24 h. Females are fertilized and either attack the same host or swim to another host, where they chew and bore their way into the host tissues as they metamorphose into adults. Within 1 day, before they have fully metamorphosed, they produce their first batch of eggs.
These hatch 24 to 36 h later and the egg sacs are then shed. A new pair of egg sacs is produced within 1 to 3 days Shields and Goode, ; Shariff and Sommerville, b. Of 71, only six survived to produce eggs. Nevertheless, in cold temperate climates, the parasites probably overwinter as metamorphosed females.
Goodwin AE, Massive Lernaea cyprinacea infestations damaging the gills of channel catfish polycultured with bighead carp. Journal of Aquatic Animal Health, 11 4 Effect of food and temperature on Aedes aegypti L. Mosquito News, 28 3 pp. One or more of the features that are needed to show you the maps functionality are not available in the web browser that you are using.
Toggle navigation. Datasheet Lernaea cyprinacea. Don't need the entire report? Generate a print friendly version containing only the sections you need.
Generate report. December Title Habit Caption Lernaea cyprinacea; close view, attached to an anal fin on a Murray cod Maccullochella peelii. Title Adult Caption Lernaea cyprinacea; adult. Geological Survey. Diseases Table Top of page anchor worm disease. Distribution Table Top of page The distribution in this summary table is based on all the information available.
Pathogen Characteristics Top of page Morphology and life cycle The adult female Lernaea cyprinacea has a small semispherical cephalothorax, which contains the mouth. Copepodids have been found on the gills of other fishes, such as African catfish Bagrus spp. Fryer, ; Shields and Tidd, In a polyculture system in southern USA, channel catfish, Ictalurus punctatus , had eight to 50 copepodids on the surface of each gill filament and small numbers of adult females on the skin, whereas thousands of adult females were on the skin of cohabiting big-head carp Aristichthys nobilis Goodwin, References Top of page Goodwin AE, Distribution Maps Top of page You can pan and zoom the map.
Unsupported Web Browser: One or more of the features that are needed to show you the maps functionality are not available in the web browser that you are using.
Please consider upgrading your browser to the latest version or installing a new browser. Top of page. Title Habit. Lernaea cyprinacea; attached to an anal fin on a Murray cod Maccullochella peelii.
Lernaea cyprinacea; close view, attached to an anal fin on a Murray cod Maccullochella peelii. Title Adult.
The present study explored the susceptibility of Puntius pulchellus subadults to Lernaea cyprinacea infection subsequent upon their first introduction to an intensive culture system that had a previous history of Lernaea infection and evaluated the efficacy of doramectin against the parasite. All the P. Pathological changes caused by the parasite as evidenced by the extensive hemorrhage and tissue necrosis of the host at the point of parasite attachment was most severe in P. On the contrary, among the fish species already present in the pond and were previously exposed to the infection before the start of the present study, only Labeo fimbriatus developed mild to moderate infection.
The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables. Table 1.
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