Skeletal Development and Mineralization Pattern of The
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e Rese tur arc ul h c & a u D q e A v e f l o o Mesa-Rodríguez et al., J Aquac Res Development 2014, 5:6 l p a m n Journal of Aquaculture r e u n o t DOI: 10.4172/2155-9546.1000266 J ISSN: 2155-9546 Research & Development Research Article OpenOpen Access Access Skeletal Development and Mineralization Pattern of the Vertebral Column, Dorsal, Anal and Caudal Fin Complex in Seriola Rivoliana (Valenciennes, 1833) Larvae Mesa-Rodríguez A*, Hernández-Cruz CM, Socorro JA, Fernández-Palacios H, Izquierdo MS and Roo J Aquaculture Research Group, Science and Technology Park, University of Las Palmas de Gran Canaria, P. O. Box 56, 35200 Telde, Canary Islands, Spain Abstract Bone and fins development in Seriola rivoliana were studied from cleared and stained specimens from 3 to 33 days after hatching. The vertebral column began to mineralize in the neural arches at 4.40 ± 0.14 mm Standard Length (SL), continued with the haemal arches and centrums following a cranial-caudal direction. Mineralization of the caudal fin structures started with the caudal rays by 5.12 ± 0.11 mm SL, at the same time that the notochord flexion occurs. The first dorsal and anal fin structures were the hard spines (S), and lepidotrichium (R) by 8.01 ± 0.26 mm SL. The metamorphosis was completed by 11.82 ± 0.4 mm SL. Finally, the fin supports (pterygiophores) and the caudal fins were completely mineralized by 16.1 ± 0.89 mm SL. In addition, the meristic data of 23 structures were provided. Results from the present study might be used as a practical guide for future studies on this field with S. rivoliana or in related species. Keywords: Amberjack; Hatchery; Abnormalities; Osteology; injection, GnRHa; Sigma-AldrichTM), based on the reported dosage [8]. Skeleton Larvae were reared under mesocosms rearing system (4.5 eggs.l-1 in two 40 m3 tanks [8]), kept under natural photoperiod and filtered natural Introduction sea water with 37 g/L salinity and temperature of 23.0 ± 0.9°C. Green Longfin yellowtail, Seriola rivoliana (Valenciennes, 1833) is one water technique was used adding live phytoplankton (Nannochloropsis -1 of the species proposed for marine aquaculture diversification, mostly sp.) to maintain a concentration of 250000 cells ml in the rearing due to its fast growth rate [1,2] and worldwide distribution. This species tanks. From 2 to 25 days after hatching (dah) rotifers, Brachionus sp., TM belongs to Carangidae family, along with other popular species like L-strain enriched with DHA Protein Selco (INVE ), were added twice Seriola dumerili (greater amberjack), Seriola lalandi (yellowtail king a day (08:00 and 14:00 h). Artemia feeding starts at 15 dah, and were TM fish) and Seriola quinqueradiata (Japanese yellowtail). Even though S. enriched with A1 Easy Selco (INVE ). Weaning protocol included TM rivoliana is commercially produced [3], studies about its biology are manual feeding from 20 dah (Genma Micro, Skretting ) to 25 dah scarce and only few reports on larval rearing have been conducted in and automatic feeding afterwards. Ecuador [4-6], Hawaii [7] and more recently in the Canary Islands [8]. Larval growth was assessed measuring the standard length (SL) In contrast, numerous studies of the genus Seriola have been published of 25 larvae, every 2 days using a profile projector (Nikon V-12A, related to the feeding requirements and nutrition [9-17], reproduction NIKONTM). A total of 75 specimens were individually stained biology [2,18-21] and culture needs [8,22-26]. (3.28 ± 0.15-16.1 ± 0.89 mm SL). To study the bone ossification, all Regarding osteology studies, previous reports illustrate the bone specimens were fixed in 10% buffered formalin, from hatching to structure development for other Seriola species. The osteological 33dah. Fixed larvae were cleared and stained with alizarin red [40]. development of the greater amberjack have been described by different Larvae were individually examined using stereomicroscopy. Drawings authors [27,28] These authors obtained distinct results probably of the different developmental stages were made using the Adobe associated to different environmental conditions and/or the number Photoshop CS3-10.0 (1990-2007 Adobe System Incorporated, United of samples. Also, the caudal skeleton development of the S. lalandi has States) directly from digital photographs. Bone description, followed been reported [29]. In addition, numerous studies have described the the terminology suggested by different authors [41-43], and their osteological development of other marine finfish species, such as Sparus abbreviations, and are illustrated in the Table 1. The angles of the spine aurata [30,31], Pagrus pagrus [32,33], Solea senegalensis [34,35], Dentex dentex [36], Argyrosomus regius [37], Epinephelus septemfasciatus [38] or Dicentrarchus labrax [39]. *Corresponding author: Mesa-Rodríguez A, Aquaculture Research Group, Science and Technology Park, University of Las Palmas de Gran Canaria, P. The objective of the present study was to chart the ossification of O. Box 56, 35200 Telde, Canary Islands, Spain, Tel: 0034928132900; Fax: the vertebral column, dorsal, anal and caudal fin complex in S. rivoliana 0034928132908; E-mail: [email protected] larvae cultured under semi intensive system conditions (mesocosms, Received July 28, 2014; Accepted September 12, 2014; Published September [8]). Larvae culture under this type of system usually performed better 22, 2014 than those cultures under intensive conditions [32]. The identification Citation: Mesa-Rodríguez A, Hernández-Cruz CM, Socorro JA, Fernández- of bony structures and mineralization pattern will serve as a tool for Palacios H, Izquierdo MS, et al. (2014) Skeletal Development and Mineralization future studies, where different factors (zootechnical, nutritional, Pattern of the Vertebral Column, Dorsal, Anal and Caudal Fin Complex in Seriola environmental parameters, etc) may affect the apparition of skeletal Rivoliana (Valenciennes, 1833) Larvae. J Aquac Res Development 5: 266. abnormalities. doi:10.4172/2155-9546.1000266 Copyright: © 2014 Mesa-Rodríguez A, et al. This is an open-access article Material and Methods distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided S. rivoliana eggs were obtained from induced spawning (hormonally the original author and source are credited. J Aquac Res Development ISSN: 2155-9546 JARD, an open access journal Volume 5 • Issue 6 • 1000266 Citation: Mesa-Rodríguez A, Hernández-Cruz CM, Socorro JA, Fernández-Palacios H, Izquierdo MS, et al. (2014) Skeletal Development and Mineralization Pattern of the Vertebral Column, Dorsal, Anal and Caudal Fin Complex in Seriola Rivoliana (Valenciennes, 1833) Larvae. J Aquac Res Development 5: 266. doi:10.4172/2155-9546.1000266 Page 2 of 6 Region Skeletal elements Abbreviations from the surface to internal bone layers (Figures 2A and 2B), whereas Vertebral Column Vertebra centra Ce in the haemal (with Hs) and caudal region (Ns and Hs modified to Notochord No support caudal fin complex) the mineralization pattern proceeds in Urostyle Ur both directions dorsal and ventrally (Ce11-21 and Ce22-23 respectively), Neural Arch Na joining in the middle of the centra (Figure 2C). Exceptionally, in Ce9 Neural Spine Ns and Ce10, the mineralization of the vertebral bodies differed from other Haemal Arch Ha vertebral structures of the prehaemal region, proceeding dorsally first Haemal Spine Hs and ventrally later on. Dorsal Ribs Eb The Na and Ha developed from centrum and fused in the middle, Pleural Ribs Plr forming the neural and haemal canals with rounded shape, later Parapophyses Pp developing into the Ns and Hs (Figures 2A-2C). The Ns and Hs angle Anterior neural zygapophysis Anz in relation to the vertebral body varied along the vertebral column, Posterior neural zygapophysis Pnz increasing in cranial-caudal direction (Figure 1G). The Hs developed Anterior haemal zygapophysis Ahz according to the angle of the first anal pterygiophore, and decreasing Posterior haemal zygapophysis Phz afterward. Caudal Fin Hypurals Hy Parhypural Ph The parapophyses (Pp) was first observed with the mineralization Epurals Ep Uroneurals Un Caudal lepidotrichia PCR Caudal Dermatotrichia SCR Dorsal Fin Predorsal Pd Hard Spines S Lepidotrichium R Proximal Pterygiophores Pr Distal Radial Dr Anal Fin Hard Spines S Lepidotrichium R Proximal Pterygiophores Pr Distal Radial Dr Table 1: Skeletal elements and their abbreviations. were measured from the beginning of the vertebral body to the tip of the spine. A total of 10 S. rivoliana reared juveniles were soft X-ray monitored (Mod. Senographer-DHR, General electric’s, USA) for meristic counts. Results Vertebral column In the present study, S. rivoliana vertebral column mineralization was initiated with the neural arches (Na1-Na3) by 4.40 ± 0.14 mm SL (Figure 1A), followed by the haemal arches (Ha1-Ha3) and the cephalic vertebrae (Ce1-4) by 4.74 ± 0.27 mm SL (Figure 1B). The ossification of the vertebral column followed a cranial-caudal direction, being totally ossified by 11.82 ± 0.4 mm SL (Figure 1G). This size marked the end of metamorphosis. The notochord flexion was initiated at 5.12 ± 0.11 mm SL (Figure 1C), at the same time that the caudal complex mineralization was initiated. Initially, urostyle was formed by two independent structures (Ur1-Ur2) that fused by 10.23 ± 0.26 mm SL (Figure 1F). The neural spine (Ns23), the haemal spine (Hs13) and the Ce22-Ce23 were the last structures