Topic
Elopiformes
About: Elopiformes is a research topic. Over the lifetime, 6 publications have been published within this topic receiving 87 citations.
Papers
TL;DR: It was concluded that the maximum size attained during larval growth is about 71 mm SL, and metamorphosis is accompanied by a decrease in length, which suggests that the migration is nocturnal.
Abstract: The leptocephalous larval stages of the bonefish (Albulidae: Albula) are abundant in the coastal regions and hypersaline lagoons (esteros) throughout the Gulf of California during winter and spring. Inshore movements of leptocephali were studied by sampling the entrance to Estero Miramar, at Guaymas, Sonora, Mexico, from February to May, 1981. Thirty-three samples were taken at various times during flood tide. All but four of the samples were taken after sunset. Leptocephali were collected in all months except May. The results suggest that leptocephali enter the estero only during the first few hours of flood tide. Large numbers of larvae were observed during the day at ebb tide maintaining their near-shore position in the entrance channel. These larvae did not appear to be migrating into the estero. This, together with the absence of larvae in daytime samples, suggests that the migration is nocturnal. Most of the 667 leptocephali collected during the sampling period had completed larval growth or were just beginning the metamorphic interval. The median standard length (SL) was 61 mm and the mode was 62 mm. The largest leptocephali measured 71 mm SL. Since metamorphosis is accompanied by a decrease in length, it was concluded that the maximum size attained during larval growth is about 71 mm SL.
24 citations
TL;DR: The present study is the first confirmed report of an aporocotylid infecting a member of Elopiformes as well as the first reported of an infection in an elopomorph outside of Australia and New Zealand or in marine waters.
Abstract: Monotypic Paracardicoloides Martin, 1974 is emended based on supplemental observations of 2 voucher specimens of Paracardicoloides yamagutii Martin, 1974. Features of the anterior sucker, esophagus, and intestine as well as the male and female genitalia previously attributed to, or omitted from the diagnosis and description of, this fluke are resolved and further detailed herein. The holotype of P. yamagutii, originally deposited in the Allan Hancock Parasitology Collection, apparently has been lost, and Queensland Museum voucher G222650 is designated as the neotype. Elopicola nolancribbi n. gen., n. sp. infects the ladyfish, Elops saurus, (Elopiformes: Elopidae) in the north-central Gulf of Mexico. The new genus resembles Paracardicoloides by having the combination of a bowl-shaped anterior sucker, inverse U-shaped intestine, short posterior ceca, post-cecal ovary, pre-ovarian ootype, compact uterus, and prominent excretory arms and vesicle. It differs from Paracardicoloides by lacking robust t...
18 citations
TL;DR: The combined data suggest that although several different body matrix GAGs have evolved in different groups of leptocephali, selection has favored GAG's with relatively low average negative charge densities, offering further support for the view that the Elopomorpha represents a monophyletic group of fishes.
Abstract: Glycosaminoglycan (GAG) composition was determined in larvae of 10 species of true eels (subdivision Elopomorpha; order Anguilliformes; families Chlopsidae, Congridae, Moringuidae, Muraenidae and Ophichthidae), two species from the subdivision Clupeomorpha (order Clupeiformes; families Engraulidae and Clupeidae) and one species from the subdivision Euteleostei (order Aulopiformes; family Synodontidae). Using a combination of specific GAG-degrading enzymes, cellulose acetate electrophoresis with known GAG standards and relative degree of staining with Alcian Blue, the predominant GAG in anguilliform leptocephali was identified as undersulfated chondroitin sulfate (uCS); the only exception was Bathycongrus macrurus (Congridae), where heparan sulfate was tentatively identified together with uCS. In representatives of the Clupeomorpha and Euteleostei, however, the predominant GAG was chondroitin sulfate; uCS was not detected. These results, combined with those from previous studies, provide data on GAG composition in 21 species from three of the four currently recognized elopomorph orders (Albuliformes, Elopiformes and Anguilliformes). The combined data suggest that although several different body matrix GAGs have evolved in different groups of leptocephali, selection has favored GAGs (mainly uCS and keratan sulfate) with relatively low average negative charge densities (average of about one negative charge per disaccharide repeat of the acidic GAG chain). The presence of normally sulfated CS (average per disaccharide negative charge density of 2) as the major GAG in the three species of non-elopomorph larvae further suggests that some aspect of the unique developmental pattern in elopomorph leptocephali may place constraints on the maximum negative charge density permitted in the body matrix GAGs. The presence of GAGs with low negative charge density is interpreted as an additional elopomorph synapomorphy, offering further support for the view that the Elopomorpha represents a monophyletic group of fishes. Possible scenarios for the evolution of GAGs in leptocephali are presented.
18 citations
TL;DR: Undersulfated chondroitin sulfate has been identified as a principal glycosaminoglycan (GAG) in whole-body extracts of leptocephalous larvae of four species of marine teleost fishes, representing two orders and three families.
Abstract: Undersulfated chondroitin sulfate (i.e., chondroitin sulfate with sulfate: hexosamine molar ratios ranging from 0.06–0.17) has been identified as a principal glycosaminoglycan (GAG) in whole-body extracts of leptocephalous larvae of four species of marine teleost fishes, representing two orders and three families. These include the eels (Anguilliformes)Ariosoma balearicum (Congridae),Rhechias dubia (Congridae) and Ophichthus sp. (Ophichthidae) and the ladyfish (Elopiformes: Elopidae: Elops saurus). A second GAG found in relatively large amounts in A. balearicum has been identified as chondroitin. Chondroitin and undersulfated chondroitin sulfate formed distinctive precipitates during extraction and were easily separated. Undersulfated chondroitin sulfate also was extracted and purified from early metamorphosing bonefish (Albuliformes: Albulidae: Albula sp.) leptocephali, where it is a minor GAG component, and was shown to be similar in composition to the compounds obtained from eels and ladyfish.
10 citations
TL;DR: Heparan sulphate was found to be the principal glycosaminoglycan (GAG) in tarpon leptocephali, with keratan sulphate also present.
Abstract: Heparan sulphate was found to be the principal glycosaminoglycan (GAG) in tarpon leptocephali, with keratan sulphate also present. The main GAG in ladyfish leptocephali appeared to be a form of chondroitin sulphate (possibly undersulphated).
8 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2014 | 1 |
| 2010 | 1 |
| 1998 | 1 |
| 1993 | 1 |
| 1991 | 1 |
| 1984 | 1 |