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http://indianaquariumhobbyist.com/community/ :: View topic - Ecological Aquatic Disasters
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Ecological Aquatic Disasters
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sandeepraghuvanshi
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PostPosted: Mon Apr 15, 2013 11:18 am Post subject: Ecological Aquatic Disasters Reply with quote

 Lake  Victoria  in  Africa  is  the  world's  largest  tropical  lake  and  the  second  largest  freshwater  lake.  It  Covers  an  area  total  of  69,000  square  kilometers,  nearly  as  large  as  Ireland.
 
 It  lies  in  an  area  known  as  Rift  Valley  of  East  Africa  and  is  home  to  one  of  the  most  diverse  ecosystems  on  earth.
 
 Till  1954  it  housed  over  500  species  of  fish  nearly  90%  of  which  were  Cichlids.
 
 Most  of  the  cichlids  found  in  this  lake  were  not  found  elsewhere.
 
 As  the  population  of  humans  increased  the  pressure  on  fisheries  increased  and  authorities  started  thinking  about  introducing  new  species.
 
 Nile  Perch  (Lates  niloticus)  was  considered  a  prime  candidate  for  introduction  as  it  was  more  economically  valuable  due  to  its  big  size.  
 The  specimens  can  reach  upto  170  kg.
 In  fifties  Nile  perch  was  gradually  introduced  in  lake  Victoria.
 It  is  now  estimated  that  Cichlids  found  in  Lake  Victoria  which  formed  nearly  90  %  of  fish  biomass  before  introduction  of  Nile  perch  now  form  less  than  1  %  of  total  fish  biomass.
 
 A  recent  program  on  Animal  Planet  showed  a  fishing  boat  taking  samples  at  6-7  places  and  only  a  handful  of  native  cichlids  could  be  seen  in  the  catch.
 Many  species  are  now  considered  extinct  and  it  is  now  said  to  be  the  largest  extinction  of  vertebrates  in  20th  century.
 
 Now  efforts  are  being  made  to  reintroduce  the  native  species.
 
 
 Many  of  our  hobbyists  have  a  habit  of  releasing  unwanted  fish  in  local  water  bodies,  which  cause  similar  destructions.
 Please  desist  from  releasing  non  natives  in  local  water  bodies.
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jabba
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PostPosted: Mon Apr 15, 2013 3:13 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 A  very  good  topic  Sandeep.
 Even  I  had  seen  that  program  but  didnt  bring  it  up  here.  Shame  on  me  Wall Bang  .
 
 Ok  this  situation  is  here  in  India  also  where  the  african  Catfish(I  am  not  sure  of  its  actual  nae  but  in  Kerala  people  used  to  call  it  African  Mushi)  and  tilapia  was  introduced  for  increasing  productivity  and  the  few  that  has  escaped  to  the  waterbodies   have  consumed  most  of  our  native  species.  Now  a  days  authorities  destory  the  African  catfish  farms  when  found.Sadly  as  You  all  know  There  is  always  a  loophole  in  Our  country  .
 
 This  may  be  also  the  case  when  people  dump  their  sucker  catfish  that  have  out  grown  the  tank  to  pondsa  and  rivers.
 So  my  request  is  ...
 1.  Make  sure  you  buy  fishes  that  will  not  out  grow  your  tank
 2.  If  it  outgrows  your  tank  because  of  your  ignorance  while  acquiring  them.  Atleast  make  sure  you  give  it  to  another  hobbyist  who  have  a  big  enough  tank  to  hold  them
 3.  This  will  be  painful  for  many  but  it  helps  to  retain  the  biological  diversity  of  our  world,  which  is  possible  due  to  the  geographical  seperation  of  many  species.  So  if  you  fail  to  do  the  above  two  things.  The  last  resort  should  be  to  kill  the  fish.
 Death  of  One  fish  is  better  than  destruction  of  many  species.
 
 I  would  suggest  every  one  to  follow  the  first  step.
 I  am  sure  that  if  we  do  a  thorough  search  we  may  even  find  Arowanas  in  our  rivers.It  is  another  invasive  species
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superbsite
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PostPosted: Mon Apr 15, 2013 3:39 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 Thanks  Sandeep  and  Jabba
 That  was  interessting  and  a  good  learn  for  us
 
 I  remember  one  of  the  Bandra  LFS  telling  me  that  there  are  customers  who  come  and  buy  goldfish  from  them  and  release  them  in  the  Bandra  Talao  Pond.  It  is  some  kind  of  spiritual  ritual  of  freeing  a  captive  pet.   Shocked  
 
 In  the  Lake  Victoria  they  should  also  reduce/fish  out  the  population  of  Nile  Perch  (Lates  niloticus)  while  introducing  native  species.  I  wonder  if  they  can  do  this  ?
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Athreyan
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PostPosted: Mon Apr 15, 2013 5:02 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 Nice  thread!
 I  also  recently  read  somewhere  about  how  Koi  Carps  have  been  banned  in  New  Zealand  as  it  started  invading  their  waters.  No  one  is  allowed  to  keep  kois.  Not  in  their  own  ponds,  not  anywhere.  Doing  so  attracts  heavy  punishment.
 
 Apparently,  some  time  back  a  consignment  of  Gold  fish  from  China/Japan  also  contained  Kois  which  were  released  in  the  waters.  This  rapidly  created  a  population  and  many  species  of  fish  and  also  aquatic  flora  are  now  at  risk.  Mainly  flora  because  Kois  keep  to  shallow  waters  and  breed  near  the  banks.  This  is  where  aquatic  flora  is  also  present  and  the  kois  damage  the  plants.
 
 what  a  pity!
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sandeepraghuvanshi
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PostPosted: Mon Apr 15, 2013 9:12 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 Ever  since  life  form  appeared  on  earth,  different  species  have  evolved  to  adjust  with  the  environment
 
 However  Humans  have  unique  ability  to  adjust  the  environment  to  a  great  extent,  however  we  seem  to  go  overboard  .while  doing  it,  we  seem  to  forget  that  we  are  not  alone  on  this  planet.
 Sometime  even  good  meaning  intervention  seem  to  misfire.
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dotfish
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PostPosted: Mon Apr 15, 2013 9:40 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 Along  with  what  Jabba  said,  Recently  I  came  across  an  article  which  Kerala  Govt  Fisheries  Dept  where  planning  to  farm  carps  in  pookot  lake  of  wayanad  and  I  was  like  what  the  hell  wrong  with  this  people?  wont  they  even  watch  Discovery  to  understand  the  disaster  it  may  cause  by  release  carp  variety  into  local  eco  system?
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aqua_2k
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PostPosted: Tue Apr 16, 2013 12:15 am Post subject: Re: Ecological Aquatic Disasters Reply with quote

 @  Sandeep...Rightly  brought  up  the  topic,  I  did  came  across  this  new  elsewhere....Just  remembering  the  crazy  incident  happened  locally  in  chennai..where  government  introduced  cat  fish  in  mylapore  temple  tank...which  soon  ate  up  the  small  fishes  in  the  pond...breaded  crazily...increased  in  vast  number...food  limitation....cannibalism  started...They  introduced  ducks  to  control  the  population...those  are  of  no  match  for  catch  fish...temple  tank  started  stinking....Finally  fishes  in  the  pond  were  let  out  on  lease....
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Ram_a_rosi
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PostPosted: Tue Apr 16, 2013 1:14 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 Sandeep
 
 This  is  a  fantastic  topic.  Mumbai's  Powai  lake  is  one  example  where  people  have  (given  freedom  to  their  pets)
 it  used  to  be  an  Anglers  delight,  with  Rohu  Catla  and  other  Carps
 But  now  they  have  started  catching  :  Pacu,  Pirhana,  flowerhorn,  and  other  Big  cat  fishes/  tiger-albino  sharks.
 Its  quite  a  pity.
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abhis9
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PostPosted: Tue Apr 16, 2013 2:07 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 Very  important  topic  Sandeep.
 
 I  stay  near  Subhas  Sarobar  (locally  we  called  only  "lake")  which  covers  an  area  of  2.5  square  kilometers.  There  is  also  Anglers  association  for  fishing.  I  also  there  for  few  time  for  100/  rupees  tickets.  There  are  lot  of  Rohu,  Catla,  Silver  Carps  etc.  My  biggest  catch  is  7.8  Kg  Silver  Carp  and  3.8  Kg.  Katla.  
 
 
 But  now!!  Horrible  situation.....People  are  getting  Pacu,  Tiger  Shark,  Albino  sharks  etc.  etc.  
 Catla,  Rohu  are  rare  now  to  catch.
 
 Now  who  will  control  this  !!  I  already  talk  with  Anglers  association  which  very  near  to  my  home,  they  told  me  they  will  look  after  this  matter.  But  I  doubt  is  there  any  effect  or  not.
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PostPosted: Tue Apr 16, 2013 2:09 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 @Ramdas
 Even  Piranha  huh  ?!.  Real  Piranha  ?  So  Powai  waters  are  all  the  more  dangerous  now  after  crocodiles  too  ?
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sandeepraghuvanshi
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PostPosted: Tue Apr 16, 2013 3:33 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

                                                   
superbsite  wrote  (View  Post):                

 In  the  Lake  Victoria  they  should  also  reduce/fish  out  the  population  of  Nile  Perch  (Lates  niloticus)  while  introducing  native  species.  I  wonder  if  they  can  do  this  ?                

 There  are  borders  of  many  countries  around  lake  Victoria,  and  they  have  now  formed  a  group  towards  protecting  indigenous  fauna.
 You  cannot  take  out  a  fish  completely  of  area  as  large  as  Lake  Victoria  that  too  a  predator.
 It  grows  huge  and  native  fisher  men  with  smaller  nets  and  boats  are  not  able  to  catch  them,  it  is  the  big  fishing  trawlers  with  extensive  nets  that  catch  bulk  of  the  fish.
 This  has  driven  the  poorer  folks  even  more  towards  starvation.
 
 The  situation  is  equally  bad  in  India  also.
 Introduction  of  Tilapia  has  wrecked  havoc  in  many  water  bodies.
 http://www.fao.org/docrep/003/V5930E/V5930E02.htm
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sandeepraghuvanshi
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PostPosted: Tue Apr 23, 2013 10:07 pm Post subject: Re: Ecological Aquatic Disasters Reply with quote

 A  recent  article  in  National  Geographic  magazine  states  that  today  we  have  the  technology  to  bring  back  extinct  animals.
 Just  wondering  which  aquatic  animals  would  be  like  to  bring  back,  any  ideas.
 Another  point  to  ponder  is  that  whether  we  should  bring  back  animals  which  are  extent.
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Athreyan
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PostPosted: Wed Apr 24, 2013 9:19 am Post subject: Re: Ecological Aquatic Disasters Reply with quote

 I  don't  think  it  is  wise  to  bring  back  extinct  animals.  The  ecology  of  Earth  would  have  changed  to  adjust  to  the  existing  environment.  Now  to  bring  them  back  would  be  disastrous  to  them  as  well  as  existing  animals.  imagine  bringing  back  dinosaurs!   Surprised
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Ram_a_rosi
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PostPosted: Wed Apr 24, 2013 9:35 am Post subject: Re: Ecological Aquatic Disasters Reply with quote

 Athreyan  /  Sandeep
 
 Yes  I  do  agree  that  animals  that  was  extinct  by  natural  selection  we  should  not  bring  back  at  all.  
 But  we  certainly  can  bring  back  animals  which  were  extinct  due  to  human  being's  greed,  and  superstition.
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PostPosted: Wed Apr 24, 2013 9:48 am Post subject: Re: Ecological Aquatic Disasters Reply with quote

 Yes  Ramdas,  I  agree  to  your  point  of  view.  But  it  needs  a  lot  of  careful  planning  &  rebuilding  of  not  just  the  species  but  its  environment  also.  For  instance,  if  a  species  became  extinct  due  to  pollution  (pollution  of  water,  for  example).  Then  we  must  first  make  necessary  amends  to  its  natural  habitat  before  we  actually  bring  the  species  back.  Also,  we  have  to  keep  in  mind  that  any  species  that  may  have  survived  the  pollution  of  the  habitat  have  done  so  due  to  some  mutational  factors  (adaptation).  These  also  have  to  be  taken  into  account.  Also,  species  hierarchies  would  have  changed.  We  all  know  how  instincts  change  over  generations.  if  a  species  has  not  seen  a  predator  for  a  few  generations  then  they  don't  have  the  instinctive  defenses  against  them.  
 
 So,  in  trying  to  do  the  right  thing,  we  cannot  have  any  half  measures.  Otherwise  it  will  only  be  a  case  of  history  repeating,  and  maybe  with  worse  consequences.
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