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<span style="font-size:16.0pt;font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman"; mso-ansi-language:EN-IN;mso-fareast-language:EN-IN;mso-bidi-language:AR-SA">Reproductive biology of the female shovel-nosed lobster <i>Thenus unimaculatus </i>(Burton and Davie, 2007) from north-west coast of India</span>

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Title Reproductive biology of the female shovel-nosed lobster Thenus unimaculatus (Burton and Davie, 2007) from north-west coast of India
 
Creator Kizhakudan, Joe K.
 
Subject Thenus unimaculatus
Maturation
Fecundity
Gonadosomatic Index
Size at first Maturity
 
Description 933-941
Reproductive biology of the female shovel-nosed lobster
Thenus unimaculatus from the north-west coast of India

was studied from samples obtained from the fishery
along Gujarat coast. Development of secondary
sexual characters, gonadal maturation, size at sexual maturity, fecundity and
Gonadosomatic Index (GSI) were assessed. Development of ovigerous setae on
abdominal pleopods and size of gonopore were identified as secondary sexual
characters indicative of the maturation state of the lobster. Onset of maturity
in females is marked by the development of ovigerous setae. There are no mating
windows (ventral sternite region) in female T. unimaculatus. Female
reproductive tract in T. unimaculatus comprises of ovaries, oviducts and
genital opening. Ovarian development in T. unimaculatus could be classified
into six stages - Immature, Early Maturing, Late Maturing/Mature, Ripe,
Spawning and Spent/Recovery. The process of ovarian maturation in T.
unimaculatus could be traced through three distinct phases depending on the
extent of yolk deposition – Pre-vitellogenesis, Primary vitellogenesis and
Secondary vitellogenesis. Morphological, physiological and functional maturity
is almost simultaneous in T. unimaculatus, with the size at first
maturity in females attained at 61-65 mm CL.

Size at onset of sexual maturity, judged from the 25%
success rate in development of different sexual characters is 51-55 mm CL.
Average fecundity for reproductively active females in the size range of 60-102
mm CL is 39300 eggs. Ovarian development corresponds well with the changes in
GSI, with maximum GSI values coinciding with the occurrence of mature
individuals.
 
Date 2016-06-23T15:30:47Z
2016-06-23T15:30:47Z
2014-06
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/28963
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(6) [June 2014]