Saturday, 5 December 2015

Atlantic Snook


Firstly I would like to explain that there are 12 species of snook. divided into two parts. 6 pacific snook and 6 Atlantic snook.

6 snook in the Atlantic consists of the 
Common snook
Fat snook
Guianan snook
Mexican snook
Swordspine snook the smallest of the snook
Tarpon snook the only snook with 7 anal soft fins

Of the twelve snook .4 species can exceed the weight of 10 lbs
2 in the Atlantic 
Common snook
Mexican snook 

The other four in each ocean can not exceed the weight of 6-8 lbs without the regards of world records 

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Name

Common snook, Centropomus undecimalis 
Snook are also known as robalo, linesiders, and sergeant fish. In the past they were known as "soapfish" when some sections of the "soapy" tasting skin were left on the fillets due to poor cleaning practices.

Appearance 
The eight species of smaller Robalo usually grow to less than 6 lbs. and can be readily distinguished by from the four larger species by their noticeably longer anal spine, anal fin configuration and body shape.The two Atlantic Ocean large Robalo species (Centropomus undecimalis "Common" and Centropomus poeyi "Mexican") are virtually identical in appearance. They can usually only be distinguished by the number of gill rakers each possesses. The Robalo or common snook (Centropomus undecimalis) commonly has eleven to thirteen non-rudimentary gill rakers and the Mexican snook (Centropomus Poeyi) is most often found to possess fifteen to eighteen non-rudimentary gill rakersDorsal spines 8 - 9, Second dorsal-fin soft rays 9 or 10, rarely 8; gill rakers 8 to 10, usually 8 or 9, on lower limb of first arch, not including rudiment; scales around caudal peduncle 22 to 28, usually 24 to 27; third dorsal-fin spine much higher than fourth when erect.

Location
Six Atlantic and six Pacific Ocean species are currently recognized as scientifically valid. All are known to inhabit Central America and all are excellent game fish .Western Atlantic: southern Florida (USA), south-eastern coast of the Gulf of Mexico, most of the Antilles and Caribbean coast of Central and South America extending southward to Rio de Janeiro, Brazil; also North Carolina and Texas, USA ,Anguilla Antigua Aruba Bahamas Barbados Belize Cayman Is. Costa Rica Cuba CUB CuraçaoI. Dominica Grenada Guadeloupe Guatemala Haiti Honduras Jamaica Martinique Mexico Montserrat Neth Antilles Nicaragua Panama Puerto Rico St Kitts Nevis St Lucia St Vincent Gren. Trinidad Tobago Turks Caicos Is. USA Virgin Is. Brazil Colombia French Guiana Guyana Suriname Uruguay Venezuela.

Habitat
Snook can tolerate a wide range of salinity and may be found in fresh water. However, they are extremely sensitive to temperature and a strong, fast moving cold front through an area containing snook may claim many lives due to the rapid drop in water temperature.Adults inhabit coastal waters, estuaries and lagoons, penetrating into freshwater, usually at depths less than 20 m. 

Spawning ground/Season
Mature individuals congregate at mouths of passes and rivers during the spawning season, May through September Maturity at around 30-45cm 

Reproduction
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer. non guarders open water/substratum egg scatterers begins life as a male and then changes into a female

Diet
Besides preying on small fish, snook also feed on shrimp, crabs, and mollusks. Snook are known as "ambush feeders" meaning that they'll surprise attack their prey as it swims or moves into range. This occurs especially at the mouths of inlets where currents play a role while the snook waits in hiding behind bridge pilings, rocks, or other submerged structures.Feed on fishes (Gobies, mojarras, Anchovies) and crustaceans (shrimps and crabs)

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Name
Smallscale Fat snook, Centropomus parallelus
Snook are also known as robalo, linesiders, and sergeant fish. English – Fat Snook, Snook, Gabb's Snook, Grabb's Snook, Little Snook, River snook, River Snook, Robalo, Salom, Small-scale Fat Snook, Chucumite .French – Crossie Chucumite, Saumon .Spanish – Calva, Chucumite, Quéquere, Robalito, Robalo, Róbalo, Robalo Blanco, Robalo Chucumite In the past they were known as "soapfish" when some sections of the "soapy" tasting skin were left on the fillets due to poor cleaning practices.

Appearance
The eight species of smaller Robalo usually grow to less than 6 lbs. and can be readily distinguished by from the four larger species by their noticeably longer anal spine, anal fin configuration and body shape. Anal fin rays 6 ,Gill rakers 15-16, Lateral scales 79 to 92, third dorsal-fin spine higher than fourth when erect. Lateral scales in juveniles normally 67 to 78

Location
Six Atlantic and six Pacific Ocean species are currently recognized as scientifically valid. All are known to inhabit Central America and all are excellent game fish. Antigua Barbuda. Barbados. Belize. Costa Rica. Cuba. Dominica. Dominican Rp. Grenada. Guatemala. Haiti. Honduras. Jamaica. Mexico. Nicaragua. Panama. Puerto Rico. St Kitts Nevis. St Lucia. St Vincent Gren. Trinidad Tobago. USA. Brazil. Colombia. French Guiana. Guyana. Suriname. Venezuela.

Habitat
Snook can tolerate a wide range of salinity and may be found in fresh water. However, they are extremely sensitive to temperature and a strong, fast moving cold front through an area containing snook may claim many lives due to the rapid drop in water temperature. Lethal minimum temperatures are around 10 degrees Celsius and normal feeding occurs above 20 degrees , Optimum temperature for growth ranges from 25 degrees to 30 degrees, juveniles are able to survive dissolved oxygen levels of 1mg , individuals of fat snook may reach up to 75 cm and weigh up to 4 kg ,females are generally larger than males of the same age , fat snook are opportunistic carnivores ,feeding on pelagic fish and crustaceans 

Spawning ground/Season
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer. the time and length of spawning season in fat snook in Brazil varies with location , in the tropics spawning occurs practically throughout the year while in temperate zones summer is the main reproductive period, In Santa Catarina State spawning peaks are observed from December to February, in Rio de Janerio State activity can occur from April to May in the mid coast .1 reproduction period was observed in the Bahia State from May to December, some males turn to female. Males reach 24 cm and females are typically larger than 30 cm in Espirito Santo, Brazil. The length at first maturity is 28 cm and has synchronous and partial spawning. Spawning occurs between March to August, with peaks in May and June. In March there is the predominance of smaller individuals, which leave the river with the increase of rivers flow rate (due to rainy season), whereas from May to July a predominance of larger individuals is observed, influenced by the decrease in the rivers flow rate and greater influence of saline wedge, which stimulates reproductive migration to the estuary

Reproduction
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer. Commercial rearing studied fat scale snook in large tanks and Temperatures maintained at 23.5 jC, with light aeration and low water exchange, eggs began hatching approximately 15 h post spawning. Eighty percent of the eggs had hatched within 12 h after spawning

Diet
Besides preying on small fish, snook also feed on shrimp, crabs, and mollusks. Snook are known as "ambush feeders" meaning that they'll surprise attack their prey as it swims or moves into range. This occurs especially at the mouths of inlets where currents play a role while the snook waits in hiding behind bridge pilings, rocks, or other submerged structures.

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Name
Largescale fat snook or Guianan snook, Centropomus mexicanus
Snook are also known as robalo, linesiders, and sergeant fish. In the past they were known as "soapfish" when some sections of the "soapy" tasting skin were left on the fillets due to poor cleaning practices.

Appearance 
The eight species of smaller Robalo usually grow to less than 6 lbs. and can be readily distinguished by from the four larger species by their noticeably longer anal spine, anal fin configuration and body shape. Scales from origin of second dorsal fin to lateral line 10 to 15, usually 11 to 14; lateral scales 68 to 79, usually 70 to 77; scales from origin of anal fin to lateral line 12 to 16, usually 13 to 15, gill rakers 4 to 6 , total gill rakers 14 to 17 usually 15 to 17 colour yellow brown to brown green above silvery on the sides and below ,fins dusky and caudal fin reddish usually grows from 18cm to 45cm .Very similar to the parallelus " Small scale " but with larger and fewer scales 

Location
Six Atlantic and six Pacific Ocean species are currently recognized as scientifically valid. All are known to inhabit Central America and all are excellent game fish. Western Atlantic, Eastern Mexico and Greater Antilles to Venezuela and Porto Alegre in Brazil.

Habitat
Snook can tolerate a wide range of salinity and may be found in fresh water. However, they are extremely sensitive to temperature and a strong, fast moving cold front through an area containing snook may claim many lives due to the rapid drop in water temperature. The snooks mingle with the mojarras and prey on fishes and shrimps attracted to the digging activity of the mojarras. The resemblance to a fish harmless to shrimps and small fishes allows the snook to approach this otherwise wary prey, an example of aggressive mimicry

Spawning ground/Season
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer.

Reproduction
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer.

Diet
Besides preying on small fish, snook also feed on shrimp, crabs, and molluscs. Snook are known as "ambush feeders" meaning that they'll surprise attack their prey as it swims or moves into range. This occurs especially at the mouths of inlets where currents play a role while the snook waits in hiding behind bridge pilings, rocks, or other submerged structures.

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Name
Mexican snook, Centropomus poeyi
Snook are also known as robalo, linesiders, and sergeant fish. In the past they were known as "soapfish" when some sections of the "soapy" tasting skin were left on the fillets due to poor cleaning practices.

Appearance
The eight species of smaller Robalo usually grow to less than 6 lbs. and can be readily distinguished by from the four larger species by their noticeably longer anal spine, anal fin configuration and body shape. A fairly large fish, moderately deep (body depth 67 to 70% of head length). Snout profile nearly straight or slightly concave;mouth large with lower jaw projecting beyond the upper.Total gill rakers on first arch 15 to 18 (modally 16) not including rudiments; 22 to 25 (modally 23) including rudiments. Third dorsal-fin spine higher than fourth when erect; second dorsal fin with 1 spine and 9 soft rays. Second anal-fin spine not reaching to vertical from caudal-fin base when deflexed. Pectoral-fin soft rays 15 to 17, normally 15 or 16. Tips of pelvic fins never reaching to the anus in specimens over 21 cm standard length. Lateral line extending to hind margin of caudal fin, number of lateral scales 73 to 80, normally 75 to 78. Scales from origin of second dorsal fin to lateral line 10 to 13, usually 11 or 12; scales from origin of anal fin to lateral line 12 to 15 (modally 13). Scales around caudal peduncle 24 to 29, usually 26 or 27. are known to reach sizes in excess of 10 lbs, Maximum size around 90 cm, 9 kg and commonly found at around 45 cm, 1.8 kg .The two Atlantic Ocean large Robalo species (Centropomus undecimalis and Centropomus poeyi) are virtually identical in appearance. They can usually only be distinguished by the number of gill rakers each possesses. The Robalo or common snook (Centropomus undecimalis) commonly has eleven to thirteen non-rudimentary gill rakers and the Mexican snook (Centropomus Poeyi) is most often found to possess fifteen to eighteen non-rudimentary gill rakers.

Location
Six Atlantic and six Pacific Ocean species are currently recognized as scientifically valid. All are known to inhabit Central America and all are excellent game fish. Reported from four countries, Belize, Mexico, Nicaragua, Trinidad Tobago.

Habitat
Snook can tolerate a wide range of salinity and may be found in fresh water. However, they are extremely sensitive to temperature and a strong, fast moving cold front through an area containing snook may claim many lives due to the rapid drop in water temperature. Inhabits coastal waters, estuaries, and lagoons, penetrating into fresh water; usually occurs at depths less than 20 m. Congregates in rivers in March.

Spawning ground/Season
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer. Spawning apparently occurs in fresh or low brackish water from June through August. No apparent extensive migrations known.

Reproduction
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer.

Diet
Besides preying on small fish, snook also feed on shrimp, crabs, and mollusks. Snook are known as "ambush feeders" meaning that they'll surprise attack their prey as it swims or moves into range. This occurs especially at the mouths of inlets where currents play a role while the snook waits in hiding behind bridge pilings, rocks, or other submerged structures.

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Name
Swordspine snook, Centropomus ensiferus 
Snook are also known as robalo, linesiders, and sergeant fish. In the past they were known as "soapfish" when some sections of the "soapy" tasting skin were left on the fillets due to poor cleaning practices. the smallest of all the snooks 

Appearance 
The eight species of smaller Robalo usually grow to less than 6 lbs. and can be readily distinguished by from the four larger species by their noticeably longer anal spine, anal fin configuration and body shape.size of 15cm to 35 cm and around 0.2kg to 0.4kg .The long, sharp spine of the anal fin, when folded against the body, extends past the beginning of the caudal (tail) fin. Dorsal spines (total): 8 - 9; Dorsal soft rays (total): 10; Anal spines: 1-3; Anal soft rays: 6. 2nd spine of anal fin greatly enlarged; body yellowish brown dorsally, silver laterally and ventrally; lateral line dusky; pectoral and pelvic fins yellow, other fins dusky
Location
Six Atlantic and six Pacific Ocean species are currently recognized as scientifically valid. All are known to inhabit Central America and all are excellent gamefish. Antigua Barbuda, Aruba, Barbados, Belize, Costa Rica, Cuba, Curaçao I. Dominica, Dominican Rp, Grenada, Guatemala, Haiti, Honduras, Jamaica, Martinique, Mexico, Nicaragua, Panama, Puerto Rico, St Kitts Nevis, St Lucia, St Vincent Gren. Trinidad Tobago, USA,
Brazil, Colombia, French Guiana, Guyana, Suriname, Venezuela
,


Habitat
Snook can tolerate a wide range of salinity and may be found in fresh water. However, they are extremely sensitive to temperature and a strong, fast moving cold front through an area containing snook may claim many lives due to the rapid drop in water temperature.


Spawning ground/Season
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer.

Reproduction
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer.

Diet
Besides preying on small fish, snook also feed on shrimp, crabs, and mollusks. Snook are known as "ambush feeders" meaning that they'll surprise attack their prey as it swims or moves into range. This occurs especially at the mouths of inlets where currents play a role while the snook waits in hiding behind bridge pilings, rocks, or other submerged structures.

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Name
Tarpon snook, Centropomus pectinatus
Snook are also known as robalo, linesiders, and sergeant fish. In the past they were known as "soapfish" when some sections of the "soapy" tasting skin were left on the fillets due to poor cleaning practices.

Appearance 
One of the snooks that grows less than 6 lbs. and can be readily distinguished by from the 2 larger species in the Atlantic by their noticeably longer anal spine, anal fin configuration and body shape. Anal-fin soft rays 7, rarely 8, pectoral-fin soft rays 13 to 15, modally 14; pectoral fin much shorter than pelvic fin; second anal-fin spine straight or slightly sigmoid and slightly out curved distally; anterior part of head upturned; lateral scales 61 to 72, usually 64 to 67. 65 scales that stretch from the head down to the tail, following the lateral line. the only snook with 7 anal fin rays excluding hard spike .Anterior part of head upturned. Tooth patch on ectopterygiod reduced or absent. Gill rakers of first arch on lower limb 14 to 17 (usually 15 or 16) not including rudiments; 15 to 20 (modally 18) including rudiments; 5 or 6 (modally 6) on upper limb not including rudiments, 6 to 9 (modally 7) including rudiments;total gill rakers on first arch 22 to 28 (usually 24 to 26) including rudiments. Dorsal-fin soft rays 10, rarely 11; third dorsal-fin spine higher than fourth when erect, second anal-fin spine not reaching to tip of third when erect, nor to vertical from caudal base when deflexed. Anal-fin with 3 spines and 7 soft rays, rarely 8. Pectoral-fin soft rays 13 to 15 normally 13 or 14. Tips of pelvic fins reaching to or past the anus. Lateral line extending to hind margin of caudal fin; lateral scales 61 to 72, usually 64 to 67. Scales from origin of second dorsal fin to lateral line 9 to 13, usually 10 to 12. Scales around caudal peduncle 20 to 22, modally 20, Grows approximately 51 cm, 1 kg and commonly found to reach 30 cm, 0.4 kgColour: yellow-brown to brown-green above, silvery on sides and below, and with a dark lateral line on sides; fins dusky, pelvic fins with a large dark, diffuse mark or spot near the tips.

Location
Six Atlantic and six Pacific Ocean species are currently recognized as scientifically valid. All are known to inhabit Central America and all are excellent gamefish.

Habitat
Snook can tolerate a wide range of salinity and may be found in fresh water. However, they are extremely sensitive to temperature and a strong, fast moving cold front through an area containing snook may claim many lives due to the rapid drop in water temperature.

Spawning ground/Season
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer.

Reproduction
Snook are protandric hermaphrodites and change sex from male to female. The actual cause of the change is not known, but current research may provide an answer.All snook hatch with the beginning gender of male. Between one to seven years however, the majority switch to females

Diet
Besides preying on small fish, snook also feed on shrimp, crabs, and mollusks. Snook are known as "ambush feeders" meaning that they'll surprise attack their prey as it swims or moves into range. This occurs especially at the mouths of inlets where currents play a role while the snook waits in hiding behind bridge pilings, rocks, or other submerged structures.

Conclusion

  • Common snook           - Belly shape straight -size above 4.5kg/10lbs -gill raker count " - "
  • Mexican snook            - Belly shape straight -size above 4.5kg/10lbs -gill raker count +
  • Fat snook                     - Belly shape round - Scales count along lateral line - least scales count
  • Small Scale Fat snook - Belly shape round - Scales count along lateral line + most scales count
  • Swordspine snook       - Anal spike reaching tail - the smallest of the snook
  • Tarpon snook              - Shape of head and the only snook with 7 anal soft fins ''excluding spike

Atom why does this post have so few pictures in it ? Snook is a Snook is a Snook except the swordspine snook , other than Location and slight DNA differences, if you manage to catch a world record , use Einstein's Mathematical problem solving graph , if you dont know what that is, simply jot down what the fish has for example: if the fish were say 4.5kg's + then we've narrowed the possible outcome to 50/50 and its either a Common Snook or a Mexican Snook from there. we count the gill rakers and if it has more than 13 non rudimentary gill rakers its a mexican snook if not then its a common snook.

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