Glochidia

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Glochidia

the parasitic larvae of freshwater bottom mollusks—Lamellibranchia—of the family Unionidae. Glochidia have bivalve triangular shells, which close by means of single, contracting muscles. The edge of each valve usually has a serrated spine. The foot is undeveloped and is equipped with a long adhesive byssal thread—the lasso. The intestines are reduced. In the early stages of their development glochidia enter the, gills of a host specimen, where they lay eggs. In the spring, with the aid of the spines and the lasso, they attach themselves to the gills and skin of fish. In this manner glochidia spread through a body of water and move against river currents. After metamorphosis, the mollusk drops to the bottom. Glochidia cause no particular damage to fish.

V. A. SVESHNIKOV

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Case study: sensitivity of mussel glochidia and regulatory test organisms to mercury and a reference toxicant.

Freshwater mussel (unionidae) abundance and diversity upstream and downstream of a superfund site on the North Fork Holston River, Saltville, Virginia

Studies of a suitable fish plasma for in vitro culture of glochidia Hyriopsis myersiana (Lea, 1856).

Phytoplankton composition of the water and gastrointestinal tract of the mussel Diplodon enno (Ortmann, 1921) from Sao Francisco river (Bahia, Brazil)/Composicao fitoplanctonica da agua e do trato gastrointestinal do molusco Diplodon enno (Ortmann) do rio Sao Francisco (BA - Brasil)

A museum voucher of this species from the Calamus Reservoir in the Loup Basin probably represents a recent colonization via glochidia infected fish.

The freshwater mussels (mollusca: bivalvia: unionoida) of Nebraska

Although the underlying basis for host specificity and host resistance to glochidia are largely unknown, local tissue reactions of the host are likely important in mediating these responses (Arey, 1921; Meyers and Millemann, 1977; Fustish and Millemann, 1978; Meyers et al.

Influence of cortisol on the attachment and metamorphosis of larval Utterbackia imbecillis on bluegill sunfish (Lepomis macrochirus)

Glochidia attach themselves to the gills of young fish from the salmon family that carry them back upstream.

WALES: Sexplosion among endangered mussels; Just 70 become 70,000

The odds against any one individual glochidium surviving are extremely large--thousands or millions of glochidia may be produced, but the vast majority never encounter a fish.

The application of the Endangered Species Act to the protection of freshwater mussels: a case study

These massulae cling to the megaspores by filamentous structures known as glochidia (except in the case of A.

Azolla: a review of its biology and utilization

In our samples, all individuals with a marsupium also carried glochidia.

Paternal mitochondrial DNA differentiation far exceeds maternal mitochondrial DNA and allozyme differentiation in the freshwater mussel, Anodonta grandis grandis

However while not examined in the present study a negative effect of increased salinity on glochidia production has been observed (Blakeslee et al.

Effect of Salinity on the Growth and Survival of the Freshwater Mussel Unio crassus in an Environmentally Disturbed River

Glochidia ydi'r enw ar y larfau bach yma ac maen nhw'n ddigon tebyg i gregyn gleision bychan.

Creu Eden fach i greaduriaid prin; BYD NATUR

Copepod parasites of fresh-water fishes and their economic relations to mussel glochidia.

First record of an epibiont protozoan Epistylis sp

The mussels were placed into in-stream holding cages so that they could easily be retrieved the following spring, when fertile females would likely be gravid, or carrying mature larval mussels called glochidia.