Length-Weight Relationships of 31 Fish and Invertebrate Species in the Northern Aegean Sea (Eastern Mediterranean Sea)
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Length-Weight Relationships of 31 Fish and Invertebrate Species in the Northern Aegean Sea (Eastern Mediterranean Sea) Angeliki Adamidou 1 & Androniki Pardalou 2 & Athanassios C. Tsikliras 2 Received: 6 February 2020 / Revised: 13 April 2020 / # Springer Nature Switzerland AG 2020
Abstract The purpose of this study was to examine the length-weight relationships (LWR) of fish and invertebrate species exploited by the small-scale coastal fleet in the northern Aegean Sea (eastern Mediterranean Sea). Length and weight measurements were collected during experimental trials carried out seasonally from April 2016 to February 2017. A total of 4358 individuals from 31 species (28 fishes, 2 crustaceans and 1 cephalopod) representing 21 families were collected. With the exception of brown comber (Serranus hepatus) and rough ray (Raja radula), all LWR slopes fall within the 2.5 to 3.5 range. The median b value for fishes was 3.11 and 50% of the b values ranged between 3.04 and 3.24. Somatic growth was isometric for 14 species, hyperallometric for 12 species, while only 5 species grew hypoallometrically. This is the first reference on LWR for sand sole (Pegusa lascaris) in the eastern Mediterranean Sea, while for snake blenny (Ophidion barbatum), common cuttlefish (Sepia officinalis) and deep-water rose shrimp (Parapenaeus longirostris) it is the first LWR in Greek waters. Keywords Length frequency distribution . Gillnets . Trammel nets . Coastal fleet . Aegean Sea
Introduction The length-weight relationships (LWR) of marine fishes and invertebrates have been widely used in fisheries biology, stock assessment and management (Froese 2006). Length is a measurement easily obtained in the field and, through the LWR, it can be converted to biomass (weight) in which catch is usually expressed (Froese et al. 2011). The main applications of LWR involve the estimation of fish biomass from the lengthfrequency distribution of a sample (individual length is a measurement easily obtained in the field, whereas individual weight is not); the conversion of growth-in-length equations into growth-in-weight for estimating weight-at-age that is commonly used in stock assessment models (Pauly 1993; Stergiou and Moutopoulos 2001); and the determination of
* Angeliki Adamidou [email protected] Athanassios C. Tsikliras [email protected] 1
ELGO-Demeter, Fisheries Research Institute, Nea Peramos, 64007 Kavala, Greece
2
Laboratory of Ichthyology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
the condition of fishes and the isometry or allometry of their growth (Le Cren 1951). LWR is the most studied biological characteristic of marine fishes in the Mediterranean Sea (Dimarchopoulou et al. 2017). Therefore, the purpose of this work was to provide information on the LWR of 31 species (28 fishes, 2 crustaceans and a cephalopod) exploited by the small-scale coastal fishery in the northern Aegean Sea (eastern Mediterranean Sea).
Materials and Methods Length and weight measurements were collected during experimental tria
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