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Freshwater Crayfish 21(1): 115-121 (2015)

PEER REVIEWED    RESEARCH ARTICLE

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Age, growth, and condition of the Mud River crayfish Orconectes ronaldi Taylor 2000 (Decapoda: Cambaridae)

Noss H, Anderson W and Simon TP  e-mail link

Published Online: 12/31/2015

Abstract

The Mud River crayfish, Orconectes ronaldi Taylor, is a native crayfish species found in the Midwestern United States in Kentucky and Indiana. Length-weight relationship, body morphometric relationship, and condition within the species native range in south-central Indiana were studied. Growth, size relationships based on gender, sexual phase for adults and juveniles and chelae-length/width relationships were used to interpret patterns in sexual dimorphism. Carapace length (CL)–wet weight (Wwt) relationships for all genders (i.e., male, female, juvenile) and all male forms (form I and II) had positive allometric growth. Male individuals were not significantly heavier than females of the same length. The maximum length and weights of males (35.1 mm CL) were longer and heavier (11.8 g) than the longest female (31.5 mm) weighing 8.3 g. No statistical difference in mean weight was observed; however, this is attributed to the accelerated development of the chelae in sexually mature form I males, whereas chelae of females grow slower throughout life. Chelae length was significantly different between male form II and male form I, and male form II and females (P = 0.004, and P = <0.001, respectively). The relatively longer chelae of form I and form II males are due to sexually dimorphic change.

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How to Cite

Noss H, Anderson W and Simon TP. (2015). Age, growth, and condition of the Mud River crayfish Orconectes ronaldi Taylor 2000 (Decapoda: Cambaridae). Freshwater Crayfish 21(1):115-121. doi: 10.5869/fc.2015.v21-1.115

 

 

Author Information

Hanna  Noss, School of Public and Environmental Affairs, Indiana University, 1315 E. Tenth Street, Bloomington, Indiana, USA47403. E-mail: hrnoss@umail.iu.edu

Wendy E. Anderson, School of Public and Environmental Affairs, Indiana University, 1315 E. Tenth Street, Bloomington, Indiana, USA47403. E-mail: weeander@indiana.edu

Thomas P. Simon,* School of Public and Environmental Affairs, Indiana University, 1315 E. Tenth Street, Bloomington, Indiana, USA47403. E-mail: tsimon@indiana.edu

Corresponding Author indicated by an *.

 

Publication History

   Manuscript Submitted: 10/23/2015

   Manuscript Accepted: 12/14/2015

   Published Online: 12/31/2015

   Published in Print: 12/31/2015

 

 

Funding Information

No specific funding statement is available for this article.

 

 



 

 

 

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