PhD thesis, Biology.
Furthermore, because elasmobranchs are devoid of gas bladders, their fins exert a greater effort toward vertical movement (Yamanoue et al., ). The internal parts of the pelvic fins of elasmobranchs are transformed into a copulatory organ, the clasper or pterygopod, present in male sharks and rays (Hildebrand and Goslow, ).Author: Ricardo Yuji Sado, Fernando Carlos de Souza, Everton Rodolfo Behr, Pedro René Eslava Mocha, Bernardo. elasmobranchs lack ciliated ORNs and the associated expression of G olf, it is unknown whether they are able to detect bile salts, though the biological relevance of this odorant class for agnathans and teleosts makes it seem likely. This study tested the hypotheses that the olfactory systems of elasmobranch fishes are able to detect bile. Comparative genomic and/or transcriptomic analyses involving elasmobranchs remain limited, with genome level comparisons of the elasmobranch immune system to that of higher vertebrates, non-existent. This paper reports a comparative RNA-seq analysis of heart tissue from seven species, including four elasmobranchs and three teleosts, focusing on immunity, but concomitantly Cited by: Protein, fat, and energy content of the edible portion of some food items used to feed elasmobranchs in captivity. Sources for nutritional content: a Lall and Parazo (); b Sidwell et.
The occurrence and functions of granulocytes in fishes varies between and within groups. Primitive groups (agnathans, holocephalans, elasmobranchs) all have eosinophils with homogeneous round granules. Elasmobranchs also have eosinophils with granules containing an axial crystalline rod, which is the sole eosinophil type present in lungfish. Previous studies assumed that small crystals of different calcium carbonate polymorphs (otoconia) were embedded upon the sensory macula within the inner ear of both elasmobranchs [29,30,31,32, 37, 40, 59,60,61] and holocephalans [8, 22, 62]. Myelin Protein Zero. Myelin protein zero is a highly conserved cell adhesion molecule responsible for the compaction of the intraperiod line (Filbin et al., ; Filbin and Tennekoon, ; Martini et al., ; Shapiro et al., ).MPZ very likely first appeared million years ago in cartilaginous fish or in placoderms, recent analysis of Ciona, lancelet (urochordate) and lamprey fully. Catalase activity was below the detection limit ( U mg − 1 protein) in 80% of the samples from I. oxyrinchus, 72% from P. glauca, 67% from M. henlei, 34% from K. audax, 37% from C. hippurus and 67% from T. less, CAT activity was 82% higher in teleosts than in elasmobranchs as a group (p = ) (Fig. 1-II).There were no significant differences in CAT activity .
J. Michael Conlon, in Handbook of Biologically Active Peptides (Second Edition), Agnatha. The Agnatha, or jawless fishes, represent the first vertebrate stock whose line of evolution diverged from that leading to gnathostomes at least million years fossil record indicates that agnathans were numerous during the late Silurian/early Devonian (– million years ago) but. Aaron P. Frenette, Brian Dixon, in Reference Module in Life Sciences, Jawless Vertebrates Lamprey and hagfish. The Agnatha, more commonly referred to as the jawless fishes, represents one of the oldest surviving lineages of vertebrates and has recently been discovered to possess cellular components of an adaptive immune system that are akin to those observed in their sister group, the. Fish Physiology: Physiology of Elasmobranch Fishes, Volume 34B is a useful reference for fish physiologists, biologists, ecologists, and conservation biologists. Following an increase in research on elasmobranchs due to the plight of sharks in today’s oceans, this volume compares elasmobranchs to other groups of fish, highlights areas of interest for future research, and offers perspective. different studies. The spiny dogfish was placed as the sister group of the teleosts within the same clade (without amniotes) (Rasmussen and Arnason, a). In the same year in a different study, the same authors concluded that cartilaginous fishes have a terminal position in .