Ontogeny of the gastrointestinal tract and selected digestive enzymes in cobia <i>Rachycentron canadum</i> (L.)

Faulk, Cynthia K.; Benninghoff, Abby D.; Holt, G. Joan

doi:10.1111/j.1095-8649.2007.01330.x

Cited by 86 publications

(60 citation statements)

References 47 publications

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“…In the earlier case, CCK levels between 0.5 -1.0 fmol larva -1 found for larval cod of comparable age (to 17 dph in Kortner et al, 2011b) in the present study might be the threshold for the regulatory role of CCK in larval cod. In general, the developmental pattern of different digestive enzymes has been described in several species, including California halibut (Paralichthys californicus) (AlvarezGonzález et al, 2005), sea bass (Cahu and Zambonino Infante, 1994), cobia (Rachycentron canadum) (Faulk et al, 2007), red drum (Sciaenops ocellatus) (Lazo et al, 2000a) and Atlantic cod (Wold et al, 2007) and has been found to be speciesspecific. It has been proposed, that digestive enzyme activities in early stages of marine fish larvae are under transcriptional control, but can be triggered by the nutritional composition of the diet (Zambonino Infante and Cahu, 2001).…”

Section: Ontogenymentioning

confidence: 99%

Hormonal control of tryptic enzyme activity in Atlantic cod larvae (Gadus morhua): Involvement of cholecystokinin during ontogeny and diurnal rhythm

et al. 2013

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Please cite this article as: Tillner, Robert, Rønnestad, Ivar, Harboe, Torstein, Ueberschär, Bernd, Hormonal control of tryptic enzyme activity in Atlantic cod larvae (Gadus morhua): Involvement of cholecystokinin during ontogeny and diurnal rhythm, Aquaculture (2013Aquaculture ( ), doi: 10.1016Aquaculture ( /j.aquaculture.2013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractThe ontogenetic development of the gut hormone cholecystokinin (CCK) and the key proteolytic enzyme trypsin was described in Atlantic cod larvae (Gadus morhua) from first-feeding until 38 days post first-feeding (dpff). CCK is known to play a major role in the endocrine control of digestive processes in mammals and adult fish, but its regulatory role in the larval stages of marine fish is largely unknown. Only small amounts of CCK were found in the body (excluding head) in cod larvae at first-feeding, but CCK levels increased exponentially with development, suggesting a more pronounced role of CCK during ontogeny. Tryptic enzyme activity increased slightly until a standard length of ca. 8 mm (approx. 33 days dpff) with a significant increase in larvae larger than 8 mm standard length, indicating limited digestive capacity in the early stages. To entangle the short-term feedback mechanism between CCK and tryptic enzyme activity, we conducted a 12 hour feeding experiment at 21 dpff. Cod larvae receiving only algae revealed a noticeable response in tryptic enzyme activity within two hours in the morning, whereas larvae fed algae and rotifers at the same time showed a slightly delayed response up to four hours. Tryptic enzyme activity remained low in the group receiving only algae as well as the two fed groups in the afternoon. No reaction in tryptic enzyme activity was observed in larvae that received a second meal of rotifers in the afternoon, indicating limited regulatory and digestive capacity to handle several meals in a short period. CCK levels remained relatively constant throughout the day but increased in the afternoon in all three groups when tryptic enzyme activity was low, suggesting that a negative feedback mechanism between CCK and tryptic enzyme activity is present in larval cod at least from 21 dpff.

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Section: Ontogenymentioning

confidence: 99%

Hormonal control of tryptic enzyme activity in Atlantic cod larvae (Gadus morhua): Involvement of cholecystokinin during ontogeny and diurnal rhythm

et al. 2013

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“…Studies dealing with organs and tissue development during the early life history of cobia are scarce, and mainly focus on the digestive tract development (Faulk et al 2007, Salze et al 2011. The aim of this study is to describe the thyroid follicle development in cobia larvae and juvenile.…”

mentioning

confidence: 99%

Thyroid gland development in Rachycentron canadum during early life stages

Otero

Rodrigues

Sampaio

et al. 2014

An. Acad. Bras. Ciênc.

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The aim of this study was to describe the ontogeny of thyroid follicles in cobia Rachycentron canadum. Larvae were sampled daily (n=15 -20) from hatching until 15 dah (days after hatching). Following, larvae were sampled every two days by 28 dah; a new sample was taken at 53 dah. The samples were dehydrated, embedded in Paraplast, and sections of 3 µm were dewaxed, rehydrated and stained with HE and PAS. A single follicle was already present 1 dah and three follicles were found 8 dah. The number of follicles increased up to 19 on 53 dah. The diameter of follicles and follicular cell height were lower 1 dah (6.83 ± 1.00 and 4.6 ± 0.01 µm), but increased from 8 dah (24.03 ± 0.46 μm e 6.43 ± 0.46 μm). From 8 dah, the presence of reabsorption vesicles was observed in the colloid and from the 19 dah some follicles did not present colloid. The early thyroid follicle appearance in cobia larvae as well as the high quantity of follicles without colloid and/or with vesicles even after the metamorphosis, might be the explanation of the fast growth of the cobia.

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“…and Chironomids+M.D. negatively affected the digestion and absorption capabilities due to possibly inadequate enzyme secretion (Faulk et al, 2007). Then, the protease activity was on the rise in an orderly manner after DAH 25.…”

Section: Discussionmentioning

confidence: 95%