This research tested the null hypothesis that there is no seasonal variation in the recruitment, body size, and growth status of juvenile Callinectes sapidus and Callinectes similis at a soft sediment site at Port Fourchon, LA, which varied in collection salinity between 17 and 37. Monthly collections of 5- to 30.6-mm carapace width (CW) juvenile crabs were made with a push net between March 2007 and February 2009. Juvenile C. sapidus were primarily recruited in March 2007, November 2007 to February 2008, June and July 2008, and in December 2008 and January 2009, whereas the major recruitment times for C. similis were April–October 2007,March–May 2008, August through October 2008 and February 2009. The ratio of juvenile C. sapidus:C. similis was not significantly related to the ambient salinity at the time of collection. The average wet weight, dry weight, and ash-free dry weight of a standard 17.5-mm CW blue crab and lesser blue crab was determined monthly with second-degree polynomial (quadratic equations fit to the data). Juvenile 17.5-mm CW C. sapidus was considerably heavier than C. similis but the percent ash of juvenile crabs of both species was the same. Missing appendages indicative of agonistic interactions or sublethal stress of both species in all collections containing at least 10 crabs were 18.7% of juvenile C. sapidus compared with 16.3%of C. similis. RNA:DNA ratios of both species indicated robust growth potential at all collections. Agonistic pressure on juvenile crabs of both species by adult blue crabs and other predators and other juvenile crabs likely limits the population size of C. sapidus and C. similis in lower Barataria Bay.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 36 • No. 1