Co‐feeding dry and live feed in first‐feeding gilthead seabream: Effects on functional development of the digestive system, larvae and postlarvae performance

This paper presents the results on the presence and characterization of microplastics (MP) in the gastrointestinal tract of gilthead seabream (Sparus aurata L.), a species of commercial interest from the Mar Menor coastal lagoon in Southeast Spain. This is the first time that microplastic ingestion is recorded in any species from this semi-enclosed bay. Stomach and intestine from a total of 17 specimens captured by local fishermen were processed, and microplastic particles and fibers found in all of them were displayed. Overall, 40.32% (279/692) of total isolated microparticles proved to be microplastics; i.e., <5 mm, as identified by FTIR spectroscopy. The average value by fish was 20.11 ± 2.94 MP kg−1, corresponding to average concentrations of 3912.06 ± 791.24 and 1562.17 ± 402.04 MP by kg stomach and intestine, respectively. Four MP forms were isolated: fiber (71.68%), fragment (21.15%), film (6.81%), and microbead (0.36%), with sizes ranging from 91 µm to 5 mm, an average of 0.83 ± 0.04 mm, and no statistically significant differences between mean sizes in stomach and intestine samples (F-test = 0.004; p = 0.936). Nine polymer types were detected, although most of fibers remained unidentified because of their small size, the presence of polymer additives, or closely adhered pollutants despite the oxidizing digestion carried out to eliminate organic matter. No significant correlation was found between main biological parameters and ingested microplastics, and high-density polyethylene (HDPE), low-density polyethylene (LDPE), polyethylene polypropylene (PEP), and polyvinyl (PV) were identified as the most abundant polymers. The average microplastic ingestion in this study area was higher than those reported in most studies within the Mediterranean Sea, and closely related to microplastic pollution in the surrounding area, although with a predominance of fiber form mainly due to fishery activities.

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Dried Rotifer Sheet: A Novel Live Feed for Rearing First-Feeding Larvae

Zebrafish ◽

10.1089/zeb.2017.1553 ◽

2018 ◽

Vol 15 (3) ◽

pp. 291-294 ◽

Cited By ~ 1

Author(s):

Hiroko Nakayama ◽

Kan Katayama ◽

Yukimasa Onabe ◽

Atsushi Sato ◽

Norihio Nishimura ◽

...

Keyword(s):

Live Feed ◽

First Feeding

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DEVELOPMENTS OF DIGESTIVE TRACT IN LARVAE OF CLIMBING PERCH, Anabas testudineus (Bloch)

Indonesian Aquaculture Journal ◽

10.15578/iaj.5.2.2010.109-116 ◽

2010 ◽

Vol 5 (2) ◽

pp. 109 ◽

Cited By ~ 1

Author(s):

Yulintine Yulintine ◽

Enang Harris ◽

Dedi Jusadi ◽

Ridwan Affandi ◽

Alimuddin Alimuddin

Keyword(s):

Digestive Tract ◽

Digestive System ◽

General Pattern ◽

Culture Conditions ◽

Yolk Sac ◽

Straight Tube ◽

Adult Type ◽

Anabas Testudineus ◽

Climbing Perch ◽

First Feeding

Climbing perch, Anabas testudineus (Bloch) is a potential species for aquaculture in Kalimantan, Indonesia and belongs to Anabantidae family. The development of its digestive tract was evaluated on larvae reared under culture conditions of 28oC-30oC, from hatching to 30 days after hatching using histological and morphological methods. The larvae were kept in six 100-L tanks. They were fed with rotifers and microalgae from day 2nd after hatching to day 10th; Artemia nauplii from day 7th to day 15th; Artemia meta-nauplii from day 15th to day 20th; and Tubifex worm from day 20th onwards. The development of digestive tract in climbing perch followed the general pattern described for other species. Shortly after hatching, its digestive system was found to be consisted of an undifferentiated straight tube laying dorsally to the yolk sac. At first feeding (day 2nd), both mouth and anus had opened and the yolk sac was partially absorbed. On day 3, the digestive tract was fully differentiated into buccopharynx, esophagus, intestine and rectum. The two pyloric caeca appeared on day 25th after hatching, indicating the transition from larval to juvenile stage and acquisition of an adult type of digestion.

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Digestive enzyme system of larvae of different freshwater teleosts and its differentiation during the initial phase of exogenous feeding

Czech Journal of Animal Science ◽

10.17221/25/2016-cjas ◽

2017 ◽

Vol 62 (No. 10) ◽

pp. 403-416 ◽

Cited By ~ 2

Author(s):

F. Lahnsteiner

Keyword(s):

Digestive System ◽

Enzyme System ◽

Digestive Enzyme ◽

Sander Lucioperca ◽

Thymallus Thymallus ◽

Exogenous Feeding ◽

First Feeding ◽

Histological Characteristics ◽

Species Specific ◽

Freshwater Teleosts

Activities of digestive enzymes and main histological characteristics of the intestine were investigated in larvae of three salmonid species (Coregonus maraena, C. atterensis, Thymallus thymallus), of burbot (Lota lota), and pikeperch (Sander lucioperca) at the onset of exogenous feeding (0 day degrees (°d)) and at 250°d thereafter. At the onset of exogenous feeding the activities of proteolytic, lipolytic, and carbohydrate splitting enzymes were detected in the intestines of all species. The enzymatic activities showed significant species specific differences indicating specializations in functionality and digestion ability. In C. atterensis and L. lota the activities of most enzymes were low in comparison to the other investigated species and therefore their digestive system was only poorly developed. In S. lucioperca it was moderately developed and in T. thymallus and C. maraena well-developed. After 250°d, the activities of the investigated enzymes changed in a very species specific way. Histologically, the intestines of the investigated species revealed no species specific differentiations at the onset of the first feeding with the exception of the absence of goblet cells in L. lota and C. atterensis. These differentiated after 250°d.

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Co-feeding of live feed and inert diet from first-feeding affects Artemia lipid digestibility and retention in Senegalese sole (Solea senegalensis) larvae

Aquaculture ◽

10.1016/j.aquaculture.2009.08.024 ◽

2009 ◽

Vol 296 (3-4) ◽

pp. 284-291 ◽

Cited By ~ 19

Author(s):

Mônica Giacometti Mai ◽

Sofia Engrola ◽

Sofia Morais ◽

Maria Célia Portella ◽

José Roberto Verani ◽

...

Keyword(s):

Solea Senegalensis ◽

Senegalese Sole ◽

Live Feed ◽

First Feeding ◽

Inert Diet ◽

Lipid Digestibility

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Assessment of the impact of the timing of first feeding with live and formulated feeds on the survival and growth of larvae Atlantic sturgeon (Acipenser oxyrinchus Mitchill) in recirculating systems

Archives of Polish Fisheries ◽

10.2478/aopf-2018-0012 ◽

2018 ◽

Vol 26 (2) ◽

pp. 111-120

Author(s):

Iwona Piotrowska ◽

Bożena Szczepkowska ◽

Mirosław Szczepkowski ◽

Michał Kozłowski

Keyword(s):

Growth Rate ◽

Body Weight ◽

Specific Growth ◽

Atlantic Sturgeon ◽

Final Body Weight ◽

Live Feed ◽

First Feeding ◽

Survival And Growth ◽

Formulated Feed ◽

Acipenser Oxyrinchus

Abstract The aim of the study was to determine the optimum timing of the first feeding of live and formulated feeds and its impact on the survival and growth of larval Atlantic sturgeon, Acipenser oxyrinchus Mitchill, reared in recirculating systems. The first experiment compared the rearing effects on larvae that were provided live feed (Artemia sp.) at first feeding on 6, 9, and 12 days post hatch (DPH). The timing of the first feeding with live feed had an impact on the specific growth rate, the final body weight, and the coefficient of body weight variation. The most advantageous rearing parameter values were noted in the group given their first feeding 9 DPH (P < 0.05). The second experiment compared the results of rearing larvae that were first given formulated feed on days 20, 25, and 30 post hatch. The highest specific growth rate and final body weight were obtained by the group of fish given their first feeding of formulated feed on day 20 post hatch (P < 0.05). The timing of the first feeding did not impact fish survival, which was above 76% (P > 0.05) in all groups. The results of the experiment indicate that the optimum timing of Atlantic sturgeon first feeding on live feed was nine DPH, and on formulated feed it was 20 DPH.

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