Poot-Salazar A et al. (2014), Use of the SLW index to calculate growth functi...

ECB-ART-43442

Sci Rep 2014 Jun 09;4:5151. doi: 10.1038/srep05151.

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Use of the SLW index to calculate growth function in the sea cucumber Isostichopus badionotus.

Poot-Salazar A , Hernández-Flores Á , Ardisson PL .

Abstract
Age and growth analysis is essential to fisheries management. Indirect methods to calculate growth are widely used; however, length frequency data analysis in sea cucumbers is complicated by high data variability caused by body wall elasticity. Here we calculated Isostichopus badionotus parameters of the von Bertalanffy growth function. In order to address bias produced by body wall elasticity, we compared the performance of four measurements and one compound index that combines different biometric parameters: the square root of the length-width product (SLW). Results showed that variability in length data due to body wall elasticity was controlled by using body length (Le) from the SLW compound index. Growth in I. badionotus follows a negative allometric tendency. Slow or zero growth periods were observed during October and November, when weather conditions were adverse.

PubMed ID: 24909262
PMC ID: PMC4048913
Article link: Sci Rep

Genes referenced: LOC100887844

Article Images: [+] show captions

References [+] :

Herrera-Silveira, Evaluation of the health status of a coastal ecosystem in southeast Mexico: Assessment of water quality, phytoplankton and submerged aquatic vegetation. 2009, Pubmed

	Figure 1. Frequency distributions of measurements and a compound index for sea cucumber Isostichopus badionotus.A total of n = 2347 sea cucumbers I. badionotus were measured during the study period in 2009 and 2010 off the Yucatan Peninsula, Mexico. (a) L distribution; (b) W distribution; (c) SLW distribution; (d)TW distribution; (e) GW distribution; and (f) weight loss from TW to GW of n = 1165 sea cucumbers, loss is indicated as a percentage and shown in bold. L: dorsal body length; W: dorsal body width; SLW: square root of length multiplied by width; TW: total weight; GW: gutted weight; SD: standard deviation; and CV: coefficient of variation in percentage, lowest value is shown in bold.
	Figure 2. Relationships between estimated lengths and weights from sea cucumber Isostichopus badionotus.Points inside the dotted circle are data recorded during 2009. TW: total weight; GW: gutted weight; and Le: estimated length from the equation Le = 1.11 + 1.28 SLW, where SLW is square root of length multiplied by width.
	Figure 3. Individual growth and relative ages by location of sea cucumber Isostichopus badionotus.Left: seasonalized VBGF (von Bertalanffy growth function) by location in cm yrâˆ’1; Right: seasonalized VBGF by location in g yrâˆ’1. Relative ages were generated for each Le and GW datum by replacing the growth parameters calculated by ELEFAN I and PROJMAT with their respective values in the seasonalized VBGF, using sub-routines programmed in Wolfram Mathematica 9Â®. Le: Estimated length; GW: gutted weight.