Length-Weight Relationships and Morphological Variability of Black- Striped Pipefish Syngnathus abaster Risso, 1827 in the Dnieper River Basin (original) (raw)
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The main objective of this study was to analyze the differences and similarities in morphometric characteristics among specimens of greater pipefish Syngnathus acus Linnaeus, 1758 that were collected and described based on data from bottom-trawl surveys and commercial trawl fisheries in the western Black Sea between September 2010 and October 2011. A total of 280 specimens were analyzed, of which 191 were female and 89 were male. Female individuals ranged from 15.6 to 33.8 cm in total length, whereas male individuals ranged from 16.6 to 39.2 cm. For the biometric analysis, 14 morphometric characteristics were analyzed. The females and males were found to differ in maximum body height, maximum body width, and head length (P < 0.05). The length–length equations for overall converted body lengths of fish were linear. The morphometric characteristics were strongly positively correlated except for head length / total length and snout width / head length (P < 0.05). The length–weight relationship of this species was described by the following equation: TW (g) = 0.0001 × TL3.415 (cm). Relationships between the characteristics were defined separately for both sexes.
International Journal of Aquatic Biology, 2015
Length-weight relationship and condition factor were investigated in seven fish species, including Barbus cyri , Capoeta gracilis , Alburnoides eichwaldi , Acanthalbarnus microlepis , Ponticola cyrius , Cobitis keyvani and Oxynemacheilus bergianus from Totkabon River. A total of 570 specimens ranging from 25.90 to 146.97 mm in total length and 0.1 to 260.3 g in total weight were collected. Based on the results, growth coefficient values “ b ” ranged from 2.429 ( A. microlpis ) to 3.71 ( C. keyvani ). All length-weight relationships were significant ( P <0.05), with r 2 greater than 0.856. The four species viz . A. microlepis , C. gracilis , P. cyrius and C. keyvani showed allometric ( b <3< b ) and three species viz . B. cyri , A. eichwaldi and O. bergianus isometric ( b = 3) growth patterns. Condition factor ranged from 0.544 ( O. bergianus ) to 0.940 ( P. cyrius ). All linear regressions were highly significant ( P <0.05). The result of this study may be useful for bio...
Journal of Wildlife and Biodiversity, 2020
This study evaluated Length-Weight Relationships (LWRs) and condition factor (K) of the juvenile and young adult fish from shallow littoral zones in some aquatic ecosystems located in Khuzestan province, Iran. In June 2015, the specimens were sampled using a seine net from the Shadegan Wetland, the Dez, and the Karkheh Rivers in the time period of increased juvenile recruitment. The LWRs of fish were calculated using linear regression log formula as log W=loga+blogTL, and the K estimated using K=W/L3. A total of 18 species belong to 5 families collected in the stations. Exotic species comprised 33.33% of the total ichthyofauna. The variation of b-value ranges between 2.65 and 3.26, and the growth pattern is isometric in all species except Acanthobrama marmid. Since the amount of K was higher than one in all species, it can be concluded that the sampling stations are favorable for the growth of the fish. As a consequence of the decreased floodplain habitats in the surrounding of the water bodies, the shallow waters of littoral zones that have suitable features for the juvenile fish can play an essential role in the survival of the native fish fauna.
Length weight Relationships of Freshwater Fish Species in Kerian River Basin and Pedu Lake
2010
"The length-weight relationships of 12 freshwater fish species collected using various mesh size of gill nets and cast nets from Kerian River basin in Perak and Pedu Lake in Kedah were estimated. Devario regina, Rasbora sumatrana, Puntius binotatus, Labiobarbus lineatus, Cyclocheilichthys apogon and Crossocheilus oblongus were caught from the Kerian River and its tributaries. Meanwhile in the Pedu Lake, there were Puntius schwanenfeldii, Notopterus notopterus, Chela sp., Mystacoleucus marginatus, Osteochilus microcephalus, and Puntius gonionotus. Fish total length (TL) and standard length (SL) and weight were recorded. The values of constants a and b were determined from the length and weight data which transform into the linear equation of lnW=lna+blnL. These parameters were then fitted to the parabolic equation, W=aL . The length-weight relationships o b f fish from both areas were significantly different at P<0.001 and the growth exponents, b, for the fishes varied from 2.665 to 4.106. The values show that most of the fishes collected from the Kerian River basin were of positive allometric growth, while the fishes from the Pedu Lake were of negative allometric forms. Based on their scores of growth exponents, the fishes were grouped into light (b<3.0), heavy (b>3.0) or isometric (b=3) indicating poor, over and symmetric growths of length and weight respectively. Crossocheilus. oblongus (b=2.8854) in the Kerian River basin belonged to the light group as well as Chela sp. (b=2.6653), M. marginatus (b=2.7046) and P. schwanenfeldii (b=2.8635) from the Pedu Lake. The heavy group from the Kerian River basin were L. lineatus (b=2.9906), D. regina (b=3.3001), C. apogon (b=3.5162), R. sumatrana (b=3.6101) and P. binotatus (b=4.1063). Meanwhile, in the Pedu Lake, this group of fish included O. microcephalus (b=3.0541), P. gonionotus (b=3.2340) and N. notopterus (b=3.2500). The condition factor of D. regina reflecting its well being and degree of fatness, was compared in four Kerian River tributaries using the mean relative condition factor (Kn). Sungai Ijok provided a much better habitat for the fish with a Kn score of 1.2089±0.1882 followed by Sungai Mahang (1.0472±0.1671), Sungai Kangar (1.0212± 0.2295) and Sungai Selama (0.9105±0.1986). The fish habitat in Sungai Ijok was significantly different from those of Sungai Mahang and Sungai Selama and the habitats at the two latter rivers were statistically different from each other at P<0.05. The values of a, b and Kn varied with age and sex of the fish, wet and dry seasons, environmental conditions and water bodies as observed in the lotic and lentic environments of the Kerian River basin and Pedu Lake respectively."
Length-weight and length-length relations for 21 fish species caught in Izmir Bay
Acta Adriatica, 2020
This study exhibits relationships between length-weight and length-length for 21 fish species caught in Izmir Bay. Coefficients a and b for the length-weight relationships (LWRs) and length-length relationships (LLRs) were calculated with W=aLb formulae and as equations of TL=a+bFL and TL=a+bSL respectively. Equations of length-length for converting standard length and fork length into total length and vice versa were proven linear. The involved relationships were significantly interrelated (R2>0.942). Values b in the LWRs varied from 2.21 to 3.96 (mean ± SE: 3.15 ± 0.08). The student’s t-test showed that 87.9% of values b were significantly different from 3.
Sexual dimorphism of the broad-nosed pipefish, Syngnathus typhle, from Aegean Sea (Turkey)
NORTH-WESTERN JOURNAL OF ZOOLOGY
Females of Syngnathus typhle have larger mouth structure than males, resulting in pronounced sexual dimorphism with respect to the mouth width/mouth height in length group II (0.54 and 0.67 respectively). The mouth was relatively wider in females compared with males (1.32mm female; 1.25mm male) and higher (2.67mm female; 2.33mm male). Additionally other measurements, such as head length (LH) and body width (WB) were significantly different between males and females. Reasons for these differences are discussed.
Some Growth Parameters of Five Fish Species in the Lower Sakarya River, Turkey
Aquatic Sciences and Engineering, 2020
In this study, a total of 1283 samples of five fish species belonging to two families, Cyprinidae and Leuciscidae, were collected from the Lower Sakarya River between June 2017 and May 2018 in order to determine some growth parameters.The samples were collected monthly with trammel net, fykenets, and electro shocker. The age of the fish was determined from the scales. The von Bertalanffy's growth model was calculated Lt = 92.18(1-e-0.054(t+0.040)) for A. brama, Lt = 69.40(1-e-0.040(t+0.030)) for B. bjoerkna, Lt = 51.09(1-e-0.114(t+0.024)) for C. gibelio, Lt = 48.11(1-e-0.088(t+0.023)) for R. rutilus and Lt = 41.74(1-e-0.104(t+0.035)) for V. vimba. The phi-prime growth performance index (Φ') value was computed as 2.628, 2.268, 2.474, 2.307 and 2.260 for A. brama, B. bjoerkna, C. gibelio, R. rutilus and V. vimba, respectively. This study provides basic information on some growth parameters of five fish species living in the Lower Sakarya River. The results of this study are useful for fishery managements and stock assessment in the Sakarya River.
The condition (K), length-weight and length-length relationships, total length (TL), fork length (FL), and standard length (SL) were described herein for the following 5 fish species inhabiting Hirfanlı Reservoir (Central Anatolia): Pseudorasbora parva, Atherina boyeri, Aphanius danfordii, Tinca tinca, and Cyprinus carpio. Fish specimens were obtained between March and November 2008 using trawl nets. The length-weight relationship exponent b value ranged from 2.896 in C. carpio to 3.67 in A. danfordii. The b value for all species deviated from 3 and positive allometric growth was observed for A. danfordii, A. boyeri, P. parva, and T. tinca. Fulton's condition factor varied between 0.604 (A. boyeri) and 1.721 (A. danfordii). The length-length relationships were significantly linear.