Basic Biological Characteristics of Siganus rivulatus Forsskål & Niebuhr, 1775 (Teleostei: Siganidae) from the Marmaris Coast, Türkiye

Project no. 33125 · Status: Kapanmış · 2025

Summary

<p>In&nbsp;this&nbsp;study,&nbsp;the&nbsp;population&nbsp;parameters,&nbsp;length–length&nbsp;relationships&nbsp;(LLRs),&nbsp;length–weight&nbsp;relationships&nbsp;(LWRs),&nbsp;age&nbsp;structure,&nbsp;and&nbsp;growth&nbsp;characteristics&nbsp;of&nbsp;Siganus&nbsp;rivulatus&nbsp;collected&nbsp;from&nbsp;the&nbsp;Marmaris&nbsp;coast&nbsp;between&nbsp;July&nbsp;2025&nbsp;and&nbsp;May&nbsp;2026&nbsp;were&nbsp;investigated.&nbsp;A&nbsp;total&nbsp;of&nbsp;117&nbsp;individuals&nbsp;were&nbsp;examined,&nbsp;comprising&nbsp;57&nbsp;males,&nbsp;39&nbsp;females,&nbsp;and&nbsp;21&nbsp;individuals&nbsp;whose&nbsp;sex&nbsp;could&nbsp;not&nbsp;be&nbsp;determined.&nbsp;Total&nbsp;length&nbsp;ranged&nbsp;from&nbsp;9.3&nbsp;to&nbsp;25.6&nbsp;cm,&nbsp;while&nbsp;body&nbsp;weight&nbsp;varied&nbsp;between&nbsp;10.69&nbsp;and&nbsp;233.96&nbsp;g.&nbsp;The&nbsp;mean&nbsp;total&nbsp;length&nbsp;and&nbsp;body&nbsp;weight&nbsp;were&nbsp;calculated&nbsp;as&nbsp;&nbsp;17.7&nbsp;±&nbsp;0.30&nbsp;cm&nbsp;and&nbsp;88.63&nbsp;±&nbsp;5.25&nbsp;g,&nbsp;respectively.&nbsp;The&nbsp;length–weight&nbsp;relationship&nbsp;for&nbsp;all&nbsp;individuals&nbsp;was&nbsp;described&nbsp;by&nbsp;the&nbsp;equation&nbsp;W&nbsp;=&nbsp;0.0063&nbsp;×&nbsp;TL³·²⁶⁸&nbsp;(r²&nbsp;=&nbsp;0.947),&nbsp;with&nbsp;an&nbsp;allometric&nbsp;coefficient&nbsp;of&nbsp;<em>b</em>&nbsp;=&nbsp;3.268&nbsp;±&nbsp;0.070&nbsp;(SE).&nbsp;The&nbsp;95%&nbsp;confidence&nbsp;interval&nbsp;(3.218–3.408)&nbsp;was&nbsp;entirely&nbsp;above&nbsp;the&nbsp;isometric&nbsp;value&nbsp;of&nbsp;3,&nbsp;indicating&nbsp;positive&nbsp;allometric&nbsp;growth.&nbsp;For&nbsp;males,&nbsp;the&nbsp;length–weight&nbsp;relationship&nbsp;was&nbsp;W&nbsp;=&nbsp;0.0035&nbsp;×&nbsp;TL³·⁴⁷⁵&nbsp;(r²&nbsp;=&nbsp;0.914),&nbsp;with&nbsp;<em>b</em>&nbsp;=&nbsp;3.475&nbsp;±&nbsp;0.144&nbsp;(SE)&nbsp;and&nbsp;a&nbsp;95%&nbsp;confidence&nbsp;interval&nbsp;of&nbsp;3.187–3.763,&nbsp;also&nbsp;indicating&nbsp;positive&nbsp;allometric&nbsp;growth.&nbsp;Similarly,&nbsp;females&nbsp;exhibited&nbsp;the&nbsp;equation&nbsp;W&nbsp;=&nbsp;0.0059&nbsp;×&nbsp;TL³·²⁸⁴&nbsp;(r²&nbsp;=&nbsp;0.935),&nbsp;with&nbsp;<em>b</em>&nbsp;=&nbsp;3.284&nbsp;±&nbsp;0.142&nbsp;(SE)&nbsp;and&nbsp;a&nbsp;95%&nbsp;confidence&nbsp;interval&nbsp;of&nbsp;3.000–3.568,&nbsp;confirming&nbsp;positive&nbsp;allometric&nbsp;growth.&nbsp;Length–length&nbsp;relationships&nbsp;were&nbsp;evaluated&nbsp;separately&nbsp;for&nbsp;males,&nbsp;females,&nbsp;and&nbsp;all&nbsp;individuals.&nbsp;Strong&nbsp;linear&nbsp;relationships&nbsp;were&nbsp;observed&nbsp;among&nbsp;total&nbsp;length,&nbsp;fork&nbsp;length,&nbsp;and&nbsp;standard&nbsp;length.&nbsp;The&nbsp;coefficients&nbsp;of&nbsp;determination&nbsp;(r²)&nbsp;ranged&nbsp;from&nbsp;0.670&nbsp;to&nbsp;0.942,&nbsp;with&nbsp;particularly&nbsp;high&nbsp;correlations&nbsp;obtained&nbsp;for&nbsp;the&nbsp;total&nbsp;length–fork&nbsp;length&nbsp;and&nbsp;fork&nbsp;length–standard&nbsp;length&nbsp;relationships.&nbsp;Age&nbsp;determination&nbsp;was&nbsp;performed&nbsp;using&nbsp;sagittal&nbsp;otoliths,&nbsp;revealing&nbsp;that&nbsp;the&nbsp;population&nbsp;consisted&nbsp;of&nbsp;individuals&nbsp;belonging&nbsp;to&nbsp;age&nbsp;groups&nbsp;II–VII.&nbsp;The&nbsp;von&nbsp;Bertalanffy&nbsp;growth&nbsp;model&nbsp;was&nbsp;estimated&nbsp;as&nbsp;Lt&nbsp;=&nbsp;31.98&nbsp;[1&nbsp;−&nbsp;e⁻⁰·¹⁴⁽ᵗ⁺¹·⁶⁹⁹⁾].&nbsp;The&nbsp;findings&nbsp;of&nbsp;this&nbsp;study&nbsp;provide&nbsp;baseline&nbsp;biological&nbsp;information&nbsp;on&nbsp;the&nbsp;growth&nbsp;characteristics&nbsp;and&nbsp;age&nbsp;structure&nbsp;of&nbsp;the&nbsp;<em>S.&nbsp;rivulatus</em>&nbsp;population&nbsp;inhabiting&nbsp;the&nbsp;Marmaris&nbsp;coast.&nbsp;Overall,&nbsp;the&nbsp;results&nbsp;are&nbsp;expected&nbsp;to&nbsp;contribute&nbsp;to&nbsp;the&nbsp;sustainable&nbsp;fisheries&nbsp;management&nbsp;of&nbsp;the&nbsp;species&nbsp;and&nbsp;to&nbsp;provide&nbsp;a&nbsp;valuable&nbsp;scientific&nbsp;basis&nbsp;for&nbsp;future&nbsp;studies&nbsp;on&nbsp;its&nbsp;population&nbsp;dynamics.</p>

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