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And Caranx Melampygus (Cuvier, 1833) from the © 2016 IJFAS Southern Red Sea, Egypt Received: 16-07-2016 Accepted: 17-08-2016

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And Caranx Melampygus (Cuvier, 1833) from the © 2016 IJFAS Southern Red Sea, Egypt Received: 16-07-2016 Accepted: 17-08-2016 International Journal of Fisheries and Aquatic Studies 2016; 4(5): 334-341 ISSN: 2347-5129 (ICV-Poland) Impact Value: 5.62 Scale characteristics of Carangoides bajad (Forsskål, (GIF) Impact Factor: 0.549 IJFAS 2016; 4(5): 334-341 1775) and Caranx melampygus (Cuvier, 1833) from the © 2016 IJFAS www.fisheriesjournal.com Southern Red Sea, Egypt Received: 16-07-2016 Accepted: 17-08-2016 Usama M Mahmoud, Sahar F Mehanna and Ashraf S Mohammad Usama M Mahmoud Department of Zoology, Faculty Abstract of Science, Assiut University, The present study aimed to screening and documenting the diversity of scale characteristics of Assiut, Egypt Carangoides bajad and Caranx melampygus from the Red Sea, Egypt. The valid useful scale Sahar F Mehanna characteristics for systematic purposes were determined in the term of morphometry and scanning National Institute of electron microscopic techniques. A wide spectrum of size-free intraspecific variations between different Oceanography and Fisheries. body regions was recorded in each species in terms of morphometric indices. The scale characters Egypt included the overall form of the scales and their morphometrics, shape of the first circuli, form of circuli, the outer lateral and inner lateral circuli, granulation of caudal field. Moreover, the forms of the lateral Ashraf S Mohammad line canal scales were valid in differentiation between species under study. National Institute of Oceanography and Fisheries. Keywords: Scale characteristics, Carangoides bajad, Caranx melampygus, scanning electron Egypt microscope, Red Sea, Egypt 1. Introduction Carangid fishes, commonly known as jacks, are important predators of reef fishes in tropical and sub-tropical oceans [1]. Carangoides bajad (Forsskål, 1775) is known in the Indian Ocean from Madagascar and the Comoros Islands to the Red Sea and is the most common jack seen on inshore reefs in the Arabian Gulf and Gulf of Oman [2]. Caranx melampygus (Cuvier, 1833) is a large-sized common piscivore fish widely distributed across Indo-Pacific coral reefs [3]. Caranx melampygus feeds almost exclusively on fishes and is considered to be the most important large predator of diurnal reef fishes in the Indo-Pacific, a single individual estimated to consume 48 kg fish yr−1 [4]. The importance of scale structure as a research material in fish taxonomy and fisheries increased with great developments in the field of microscopy. Application of scanning electron microscopy (SEM) to reveal morphology, ultrastructure and surface ornamentation of fish scales had facilitated its utility to distinguish the taxonomic groups over a continuum ranging from higher taxa to species. Many authors have strongly emphasized on the validity of scale morphology and ultrastructural characteristics for fish taxonomy and phylogeny [5-21]. In addition to the systematic status, the functional approach of the ultrastructure and superficial ornamentation of teleost scales also attracted the attention of the aforementioned recent authors. Studies that use the morphometric characteristics of scales from different body regions in fish taxonomy were rare [e.g. 22, 23, 9, 10, 8, 12, 13, 18]. Most of these studies aimed to establish a wide range of valuable scale characters that can reflect a well-defined taxonomic status and a well- founded phylogenic tree of fish taxa. The present study aimed to screening and documenting the diversity of scale characteristics of Carangoides bajad and Caranx melampygus from the Red Sea, Egypt. In an attempt to determine the valid scale characters for fish identification and to give an interpretation for the surface scale ornamentation in terms of functional approaches. Correspondence 2. Materials and Methods Usama M Mahmoud 2.1 Specimens collection Department of Zoology, Faculty A total of 880 scales were collected from Carangidae species. 480 scales from Carangoides of Science, Assiut University, bajad (145 – 515 mm in Standard Length (SL) and 400 scales from Caranx melampygus(145 – Assiut, Egypt 631 mm in SL) were examined to elucidate their scale structure characteristics. ~ 334 ~ International Journal of Fisheries and Aquatic Studies These specimens were randomly collected from the southern morphometric indices of scales using SPSS package, release Red Sea, at Elba National Park (Shalateen fishing port) 520 9.0.0 (SPSS, 1998) [24]. Km south of Hurghada, Egypt during the period from November 2013 to October 2014. 2.4 Electron Microscopy Scanning Electron Microscopy (SEM) was used to study the 2.2 Scale Preparation and measurements morphology and microstructures of the scales in the rostral, The examined scales were gently removed from eight regions lateral and caudal regions. The cleaned and dried scales that on the left side of the body (Fig. 1): are used for Scanning Electron Microscope (SEM) 1. Region A, below the anterior part of the second dorsal fin examination were mounted and fixed by sticker tape on a region (BDFS). specimen holder and coated with a 30 nm layer of gold. The 2. Region B, anterior lateral line region (ALLS). electron micrographs were produced on GAOL, 3. Region C, middle lateral line region (MLLS). GSM5400LV, SEM in back scattering mode and on a Stereo 4. Region D, posterior lateral line region (PLLS). Scan Cambridge Mark 2A (15 kv) in Assiut University 5. Region E, behind the operculum region (BOS). Electron Microscope Center, Assiut, Egypt. 6. Region F, beside pelvic fin base region (BPS). 7. Region G, beside the anterior part of anal fin region (BAS) 8. Region H, a level behind the pectoral fin region (LBPS). Fig. 2: A photograph of a representive scale of Carangoides bajad showing the different regions, terms, and morphometric measurements used to study scales of Carangidae species L: Scale length; L1: Caudal field length; L2: Rostral field length; W: scale width. 3. Results 3.1 General morphology of the scales All scales of Carangoides bajad and Caranx melampygus are mainly of the cycloid type on all parts of the body (Fig. 3). No Fig 1: Schematic drawing of Carangidae species showing regions of ctenii found in the granulation area of the caudal field. All the scales collection. selected scales of the Carangoides bajad and Caranx melampygus were simple scales (i.e. without radii). The scales The Examined scales were cleaned carefully to remove the of the two species were smooth. The scales of Carangoides adhering tissues debris without damage in the scale surface. bajad and Caranx melampygus were in two forms: Form (1): Then they were immersed in a solution of 10% ammonia for with small rounded focus, long rostral field and big scale 24-48 h to soften adhering tissues and to clean them. Cleaned width (Fig. 3A). Form (2): with a large rounded focus, short scales were dried on a filter paper and kept them between two rostral field and small scale width (Fig. 3B). The form (1) was glass slides. The scales of the eight regions were used for found to be predominant in all scales considered. morphometric measurements. Scales forming the lateral line canal were examined to show the lateral line pattern. 3.2 Morphometrics Figure 2 shows the structure of a sectioned scale and the Tables 1 and 2 show the basic statistics of the scale morphometric measurements considered; (L: scale length; L1: morphometric indices (L1/L, L2/L, L1/L2 and W/L) of caudal field length; L2: rostral field length; and W: scale Carangoides bajad and Caranx melampygus from eight width). The raw data were treated in terms of indices (L1/L, different body regions. The indices of Carangoides bajad and L2/L, L1/L2 and W/L). Caranx melampygus show highly significant intraspecific variations in different body regions (P<0.01). Such 2.3 Statistical analysis morphometric indices were size-free in the two species under Basic statistics of scale characteristics were estimated. To investigation (Tables 3 and 4). clarify intraspecific variations of both species Carangoides bajad and Caranx melampygus, ANOVA was applied on the ~ 335 ~ International Journal of Fisheries and Aquatic Studies (a) (b) Fig 3: Two representative scales forms of Caranx melampygus from the southern Red Sea of Egypt. A: form 1; B: form 2. Table 1: Basic statistics (Mean±SD and Range) of the morphometric indices of scales from eight regions of Carangoides bajad from the southern Red Sea of Egypt. Region A (N=21) Region B (N=21) Region C (N=21) Region D (N=21) Index Mean±SD(Max-Min) Mean±SD(Max-Min) Mean±SD(Max-Min) Mean±SD(Max-Min) L1/L%* 56.2±1.3(54.0-59.3) 56.2±1.9(53.6-61.1) 54.9±1.2(52.5-57.1) 54.7±1.4(51.1-56.6) L2/L%* 43.8±1.3(40.7-46) 43.8±1.9(38.9-46.4) 45.1±1.2(42.9-47.5) 45.3±1.4(43.4-48.9) L1/L2%* 128.4±7.1(117.4-145.8) 128.7±10.6(115.4-157.1) 122±5.9(110.5-133.3) 120.7±6.8(104.7-130.5) W/L%* 108.5±20.7(82.9-141.9) 110.8±17.4(82.4-138.5) 104.1±17.4(80.9-137.3) 109.7±15.4(84-134.6) Region E (N=21) Region F (N=21) Region G (N=21) Region H (N=33) Index Mean±SD(Max-Min) Mean±SD(Max-Min) Mean±SD(Max-Min) Mean±SD(Max-Min) L1/L%* 55.1±1.5(52.9-58.2) 55.1±1.2(52.9-57.3) 55.2±1.1(53.3-57.4) 57±2.3(53.9-61.5) L2/L%* 44.9±1.5(41.8-47.1) 44.9±1.2(42.7-47.1) 44.8±1.1(42.6-46.7) 43±2.3(38.5-46.1) L1/L2%* 123±7.7(112.1-139.3) 122.9±5.8(112.5-134.3) 123.5±5.4(114.3-134.6) 133.2±12.9(117.1-159.6) W/L%* 114.3±14.5(91.3-141.7) 109±14.1(84.1-134) 118.5±15.5(97.8-150) 99.5±6.8(87.8-116.7) *.
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