Summary To study the reproductive biology of Horabagrus brachysoma (Günther, 1864), monthly samples were collected from the riverine stretches of Lake Vembanad during 2001–2002. The sexes can be distinguished only during the breeding season; male to female ratio in the exploited catch was 1 : 1.97. The mean LT at first maturity (L50) was 18.5 cm in females and 17.5 cm in males. Absolute fecundity varied between 1100 and 124 000, with a mean of 20 472. The ovary showed group synchronous development and the oocyte diameter varied between 0.13 and 1.63 mm. The relatively high fecundity and hardy nature of H. brachysoma may favour the expansion of this indigenous catfish throughout the culture systems.
C omm u n fi c a ft fi o n C a p ft fi v e b r e e d fi n g f o r c o n s e r v a ft fi o n o f D u s s um fi e r ' s C a ft f fi s h ( A c ft fi n o p ft e r y g fi fi : S fi l u r fi f o rm e s : C l a r fi fi d a e : C l a r fi a s d u s s um fi e r fi ) a N e a r T h r e a ft e n e d e n d em fi c c a ft f fi s h o f p e n fi n s u l a r I n d fi a K . G . P a dm a k um a r , L . B fi n d u , P . S . S r e e r e k h a , N fi ft a J o s e p h , A n u r a d h a K r fi s h n a n , P . S . M a n u & V . S . B a s h e e r 2 6 J u l y 2 0 1 7 | V o l . 9 | N o . 7 | P p . 1 0 3 8 0 -1 0 3 8 5 1 0 . 1 1 6 0 9 / j o ft . 2 4 4 4 . 9 . 7 . 1 0 3 8 0 -1 0 3 8 5 T h r e a ft e n e d T a x a T h e J o u r n a l o f T h r e a ft e n e d T a x a fi s d e d fi c a ft e d ft o b u fi l d fi n g e v fi d e n c e f o r c o n s e r v a fi o n g l o b a l l y b y p u b l fi s h fi n g p e e r -r e v fi ew e d a r fi c l e s o n l fi n e e v e r y m o n ft h a ft a r e a s o n a b l y r a p fi d r a ft e a ft www . ft h r e a ft e n e d ft a x a . o r g. A l l a r fi c l e s p u b l fi s h e d fi n J o T T a r e r e g fi s ft e r e d u n d e r C r e a fi v e C omm o n s A ft r fi b u fi o n 4 . 0 I n ft e r n a fi o n a l L fi c e n s e u n l e s s o ft h e rw fi s e m e n fi o n e d . J o T T a l l ow s u n r e s ft r fi c ft e d u s e o f a r fi c l e s fi n a n y m e d fi um , r e p r o d u c fi o n , a n d d fi s ft r fi b u fi o n b y p r o v fi d fi n g a d e q u a ft e c r e d fi ft ft o ft h e a u ft h o r s a n d ft h e s o u r c e o f p u b l fi c a fi o n .O P E N A C C E S S P a r ft n e r www . ft h r e a ft e n e d ft a x a . o r g I S S N 0 9 7 4 -7 9 0 7 ( O n l fi n e ) | I S S N 0 9 7 4 -7 8 9 3 ( P r fi n ft ) Competing interests: The authors declare no competing interests.Author Contribution: KGP: design the work, supervised the data collection and wrote the manuscript; BL: data collection, data analysis and manuscript preparation; PSS, NJ, PSM and AK: Sample collection and data analysis; VSB contributed in the data analysis and edited the manuscript. All authors read and approved the final version of the manuscript. Acknowledgements:We would like to thank the Indian Council of Agricultural Research (ICAR) for financial support and Kerala Agricultural University (KAU) for the facilities provided during the investigation period. . Spawning occurred after 12-14 hr of injection and fertilized eggs hatched after 16:30hr. Larval rearing was carried out in cement cisterns and the larvae attained a mean size of 51.6±1.6mm in 60 days. Since brooders of this species have become extremely rare in nature, the present study on captive breeding by hormonal manipulation methods without sacrificing the male fishes, assumes significance for conserving this endemic species.
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