| General information |
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Megalops atlanticus (Valenciennes, 1847) |
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| Common name | Tarpon, Peixe-prata |
| Synonyms |
- |
| IUCN Red List status (2014) |
Vulnerable (VU) |
| Habitat |
Saltwater and freshwater |
| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Elopiformes; Megalopidae. |
| Geographical distribution |
Angola; Nigeria; Cameroon; Ghana; Mauritania; Ivory Coast; Liberia; Senegal; Guinea; Sierra Leone; UK; France; Spain; Portugal; USA; Mexico; Canada; Brazil; Colombia; Venezuela; Guyana; Suriname; French Guiana; Panama; Cuba; Jamaica; Puerto Rico; Costa Rica; Nicaragua; Haiti; Dominican Republic; Guatemala; Honduras; Anguilla; Antigua and Barbuda; Aruba; Bahamas; Barbados; Belize; Bermuda; British Virgin Islands; Cayman Islands; Curaçao Island; Grenada; Guadeloupe; Martinique; Montserrat; Saint Kitts and Nevis; Saint Lucia; Saint Vincent and the Grenadines; Trinidad and Tobago; Turks and Caicos Islands; Virgin Islands (USA); Benin; Cape Verde; Democratic Republic of the Congo; Republic of the Congo; Equatorial Guinea; Gabon; Gambia; Sao Tome and Principe; Togo |
| Occurrence |
native: Angola; native: Nigeria; native: Cameroon; native: Ghana; native: Mauritania; native: Ivory Coast; native: Liberia; native: Senegal; native: Guinea; native: Sierra Leone; native: UK; native: France; native: Spain; native: Portugal; native: USA; native: Mexico; native: Canada; native: Brazil; native: Colombia; native: Venezuela; native: Guyana; native: Suriname; native: French Guiana; native: Panama; native: Cuba; native: Jamaica; native: Puerto Rico; native: Costa Rica; native: Nicaragua; native: Haiti; native: Dominican Republic; native: Guatemala; native: Honduras; native: Anguilla; native: Antigua and Barbuda; native: Aruba; native: Bahamas; native: Barbados; native: Belize; native: Bermuda; native: British Virgin Islands; native: Cayman Islands; native: Curaçao Island; native: Grenada; native: Guadeloupe; native: Martinique; native: Montserrat; native: Saint Kitts and Nevis; native: Saint Lucia; native: Saint Vincent and the Grenadines; native: Trinidad and Tobago; native: Turks and Caicos Islands; native: Virgin Islands (USA); native: Benin; native: Cape Verde; native: Democratic Republic of the Congo; native: Republic of the Congo; native: Equatorial Guinea; native: Gabon; native: Gambia; native: Sao Tome and Principe; native: Togo |
| Remarks |
No heteromorphic chromosomes evidenced. |
| Karyological information |
| Record 1 |
| Geographical area of study |
Brazilian Northeast coast, in the Rio Grande do Norte State. |
| Source of chromosomes |
Kideny |
| Number of specimens with sex |
5 |
| Diploid chromosome number |
50 |
| Karyotype formula |
50a |
| Fundamental arm number |
50 |
| Chromosome length |
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| Sex chromosome |
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| Chromosome staining/banding/FISH |
Heterochromatic blocks occur mainly in centromeric regions of chromosome pairs (8, 10, 12), but also in terminal regions of some pairs (5, 7, 17). Ag-NORs interstitially located in the long arms of the smallest 25th pair, which are in agreement with the location of the 18S rDNA hybridization signals. 5S rDNA sites are located in short arms of chromosome pair 7. (TTAGGG)n probe hybridized exclusively on terminal regions of chromosomes. |
| Reference |
Soares RX, da Costa GWWF, Cioffi MB, Bertollo LAC, Motta-Neto CC, Molina WF (2021). Molecular cytogenetics insights in two pelagic big-game fishes, the tarpon, Megalops atlanticus (Elopiformes: Megalopidae), and the Atlantic sailfish, Istiophorus platypterus (Istiophoriformes: Istiophoridae). Neotrop Ichthyol., 19(2): e210007. https://doi.org/10.1590/1982-0224-2021-0007 |
| Record 2 |
| Geographical area of study |
Fishing village of Ajuruteua Beach, Amazon Coastal Zone, Para, Brazil. |
| Source of chromosomes |
Cell cultures from kidney biopsies. |
| Number of specimens with sex |
5 |
| Diploid chromosome number |
50 |
| Karyotype formula |
50a |
| Fundamental arm number |
50 |
| Chromosome length |
- |
| Sex chromosome |
- |
| Chromosome staining/banding/FISH |
Positive C-bands observed in centromere of all chromosomes, along with interstitial heterochromatic blocks in pairs 3 and 9. Silver nitrate positive nucleolar signals observed in centromeric region of chromosome pair 14. 18S rDNA and 5S rDNA probes hybridized in the centromeres of pair 14. |
| Reference |
de Sousa RPC, Silva-Oliveira GC, Furo IO, de Oliveira-Filho AB, de Brito CDB, Rabelo L, Guimarães-Costa A, de Oliveira EHC, Vallinoto M. (2021). The role of the chromosomal rearrangements in the evolution and speciation of Elopiformes fishes (Teleostei; Elopomorpha). Zoologischer Anzeiger, 290: 40-48. |
| Cross Link |