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http://indianaquariumhobbyist.com/community/ :: View topic - Ichthyology 101
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Ichthyology 101

 
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random2
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PostPosted: Tue Oct 29, 2013 11:02 am Post subject: Ichthyology 101 Reply with quote

 We  come  across  scientific  papers  on  the  fishes  of  our  interest  when  we  are  researching.  Most  of  the  times,  I  struggle  quite  hard  to  understand  few  of  the  terms  used.  
 
 The  aim  of  this  thread  is  to  
 (1)  Share/discuss  terms  used  -  These  might  be  available  at  various  other  sources.  But  once  we  get  a  context,  its  better  to  remember
 (2)  Add  basics  of  Ichthyology  whenever  we  come  across  new(relative  term)  things
 (3)  Hope  that  experts  will  pitch  in  to  add/clarify  on  things
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random2
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PostPosted: Tue Oct 29, 2013 11:08 am Post subject: Re: Ichthyology 101 Reply with quote

 Demersal  -  According  to  dictionary  -  'Dwelling  at  or  near  the  bottom  of  a  body  of  water'
 
 
 Benthic  -  Bottom  dwelling
 Could  we  say  -  loaches,  catfishes?
 
 
 Benthopelagic  -  Forms  which  hover  or  swim  just  over  the  floor
 Certain  forms  of  barbs?
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sandeepraghuvanshi
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PostPosted: Tue Oct 29, 2013 12:31 pm Post subject: Re: Ichthyology 101 Reply with quote

 Bathypelagic  :  Fish  living  at  a  depth  between  1000  m  and  4000  m,  but  well  off  the  bottom.
 Benthic  :  Fish  which  are  bottom-dwelling,  living  on  the  sea  bed/river  bed
 Benthopelagic  :  Fishes  that  swim  just  above  the  river/seabed  at  depths  below  about  200  m.
 
 I  am  already  in  process  of  developing  a  aquatic  glossary  for  project  of  mine,  let  me  know  which  more  are  needed.
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random2
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PostPosted: Tue Oct 29, 2013 1:10 pm Post subject: Re: Ichthyology 101 Reply with quote

 @Sandeep  -  Thanks
 
 You  can  add  which  ever  terms  you  want  to  add.  We  could  take  certain  topic  and  cover  that  in  few  weeks.  Like  now  regions  where  fauna  is  found.  Similarly,  we  could  cover  views,  morphological  terms  etc.  I  am  hoping  that  more  hobbyists  pitch  in  so  that  we  can  all  learn.
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rasikanayak
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PostPosted: Wed Oct 30, 2013 10:19 am Post subject: Re: Ichthyology 101 Reply with quote

 Basic  anatomy.
 
 
 Regards,
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random2
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PostPosted: Fri Nov 01, 2013 11:18 am Post subject: Re: Ichthyology 101 Reply with quote

 Thanks  Nayak.  Have  learnt  a  lot  from  discussions  between  you  and  Marc.
 
 Epipelagic  -  Region  from  the  surface  till  200m  down
 
 Pelagic  fishes  -  Fishes  which  are  not  demersal.
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sandeepraghuvanshi
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PostPosted: Thu Jan 30, 2014 11:16 am Post subject: Re: Ichthyology 101 Reply with quote

 These  are  some  important  measurements  used  in  describing  a  fish.
 
 Standard  length   :-  The  straight-line  measurement  taken  from  tip  of  snout  to  the  beginning  of   (caudal)  tail  fin.  
 
 Total  Length  :-  The  straight-line  measurement  taken  from  tip  of  snout  to  the  end  of  caudal  (tail)  fin.  
 
 Head  Length  :-  The  straight-line  measurement  taken  from  front  of  snout  to  the  back  of  operculum  (bony  gill  cover).  
 
 Pre  dorsal  length  :-  The  straight-line  measurement  taken  from  front  of  snout  to  the  insertion  of  first  ray  of  dorsal  fin.
 
 Pre-pectoral  length  :-  The  straight-line  measurement  taken  from  front  of  snout  to  origin  of  pectoral  fin.  
 
 Body  depth  :-  The  vertical  distance  from  the  dorsal  (upper)  margin  of  the  body  to  the  ventral(lower)  margin  of  the  body  measured  at  the  base  of  the  pectoral  fin  where  it  attaches  to  the  body.
 Fins  or  fin  bases  are  not  included  in  the  measurement.
 
 Nape  :-  The  part  of  the  back  that  extends  from  the  margin  of  the  skull  to  the  dorsal-fin  origin;  also,  the  region  of  the  head  above  and  behind  the  eyes.
 
 Pre-orbital  length  :-  The  straight-line  measurement  taken  from  front  of  snout  to  anterior  of  eye.  
 
 Eye-  diameter  :-  Diameter  of  eye.  
 
 Interorbital  :-  The  space  between  the  eyes,  on  top  of  the  head;  bones  on  the  roof  of  the  skull  between  the  eyes.  
 
 Pre-pelvic  Length  :-  The  straight-line  measurement  taken  from  front  of  snout  to  insertion  point  of  pelvic  fin.  
 
 Pre-anal  length  :-  The  straight-line  measurement  taken  from  tip  of  snout  to  posterior  edge  of  the  anus.  
 
 Fork  length  :-  Length  of  a  fish  measured  from  the  tip  of  the  snout  to  the  posterior  end  of  the  middle  caudal(tail)  rays.  This  measurement  is  used  in  fish  where  it  is  difficult  to  ascertain  the  end  of  vertebral  column.  
 
 Caudal  peduncle  length  :-  The  straight-line  measurement  taken  from  insertion  of  the  anal  fin  and  the  caudal  fin.
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Chetesh
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PostPosted: Fri Jan 31, 2014 9:29 am Post subject: Re: Ichthyology 101 Reply with quote

 Anadromous  -  Fishes  which  migrate  upstream  from  sea  into  freshwater  for  spawning.
 Catadromous  -  Fishes  which  migrate  downstream  from  freshwater  to  sea  for  spawning.
 
 
 
 
 
 Regards,
 
 Chetesh
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