The jumbo or Humboldt squid, Dosidicus gigas , is an important fisheries resource and a significant participant in regional ecologies as both predator prey. It the largest species oceanic squid family Ommastrephidae has known potential fecundity of any cephalopod, yet little understood about its reproductive biology. We report first discovery naturally deposited egg mass well spawning eggs captivity. was found warm water (25–27°C) at depth 16 m far larger than masses previously reported....

The application of β-1,3/1,6-glucan derived from yeast at five concentrations (0%, 0.5%, 1.0%, 1.5%, and 2.0%) in formulated diets was evaluated juveniles for its effects on the growth, survival, digestive enzymatic activity, expression genes associated with immune system (interlukin-10 (IL-10), transforming growth factor (TGF), occludin (OCC), mucin2 (MUC2), lysozyme (LYS), nucleotide-binding oligomerization domain 2 (NOD2)) tropical gar (Atractosteus tropicus). For experiment, three...

The physiological transition to aerial breathing in larval air-breathing fishes is poorly understood. We investigated gill ventilation frequency (fG), heart rate (fH), and air (fAB) as a function of development, activity, hypoxia, temperature embryos/larvae from day (D) 2.5 D30 posthatch the tropical gar, Atractosteus tropicus, an obligate breather. Gill at 28°C began approximately D2, peaking ∼75 beats/min on D5, before declining ∼55 D30. Heart beat ∼36-48 h postfertilization ∼1 hatching....

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 313:125-133 (2006) - doi:10.3354/meps313125 Spawning by jumbo squid Dosidicus gigas in San Pedro Mártir Basin, Gulf of California, Mexico William F. Gilly1,*, Carl A. Elliger1, Cesar Salinas2, Susana Camarilla-Coop2, Gastón Bazzino2, Michael Beman3 1Hopkins Station, Department Biological Sciences, Stanford...

<p class="1Body">Common snook (<em>Centropomus undecimalis</em>) is a marine species with high aquaculture potential; although its digestive physiology still unknown and knowledge of that could allow the development balanced feed for commercial culture this fish. The objective study was to partially characterize proteases in <em>C. undecimalis</em> using electrophoretic biochemical techniques. A total 50 wild juveniles were used determine optimal values pH...

Tropical gar, Atractosteus tropicus, is a carnivorous fish species from Southern México with high value and acceptance in local markets. Therefore, the present study aims to spare proteins diets for larviculture of this species. An experiment was performed using three different experimental increasing carbohydrate levels based on potato starch (S) decreasing protein content (P) total energy: 16% S (16% S–44% P), 22% (22% S–40% P) 28% (28% S–36% P). gar larvae (five days post-hatching, 2.1 mm...

The jumbo squid Dosidicus gigas is the only ommastrephid commercially caught in Mexico. Despite economic and ecological importance of this species, little known about its early life stages. relationship between presence paralarvae mesoscale oceanic features was investigated for first time central Gulf California, Mexico February, April, June September 2008. A total 86 were found (summer season), well-stratified column water where thermocline evident warm sea surface waters (27.7° to 29.4°C)...

Five experimental diets containing different lipid sources, fish oil (D1), soybean lecithin (D2), corn (D3), canola (D4) and olive (D5), were evaluated in Atractosteus tropicus larvae for the relative gene expression of enzymes fatty acid synthase (fas), acetyl-CoA carboxylase 1 (acc1) carnitine palmitoyltransferase 1C (cpt1c), addition to their effects on larval growth, survival cannibalism during a 30-day feeding trial. Higher growth obtained treatments D1 D2, lower performance D3, D4 D5....

Abstract. The rhynchoteuthion stage of the jumbo squid, Dosidicus gigas , has morphological characteristics similar to paralarvae purpleback Sthenoteuthis oualaniensis making it difficult determine locations, seasons, and conditions where spawning squid occurs. In this study, 180 D. were collected off west coast Baja California peninsula identified by sequencing a 369‐bp fragment cytochrome oxidase I gene. Of these, 77 specimens, 0.8–6.0 mm in mantle length, described. Indices based on...

The digestive system of 36 paralarvae and 150 juvenile Dosidicus gigas were analysed to determine the diet. early life stages collected in central south region Gulf California during different years ranged dorsal mantle length (ML) from 2.8 120.5 mm. food content was separated first into identifiable material (IM) non-identifiable (NIM). All contained only NIM stored mainly caecum rather than stomach. Juvenile squid feed on nine prey types: euphausiids, copepods, amphipods, unidentified...

Partial characterization of digestive proteases in the three-spot cichlid Cichlasoma trimaculatum juveniles was conducted. It determined that there is higher alkaline activity (3.95 ± 0.32 IU mg−1 protein) compared to acidic (2.01 0.57 protein). Optimal temperature for 60 °C which resulted more thermostability changes. On other hand, optimal 50 °C. pH 2, while proteases, it 10, stability relation changes than protease. The use specific inhibitors and SDS-PAGE electrophoresis analysis...

A total of 300 Centropomus undecimalis juveniles, with an average initial weight 3.16 0.28 g and length 7.17 0.22 cm, were reared for eight weeks using a recirculating system to determine the dietary protein requirement their growth survival. The eect ve experimental diets containing 40, 45, 50, 55 60% content two salinities (brackish water, BW at 5 UPS marine MW 36 UPS) assessed. Fish fed times per day 2.5% biomass. All treatments performed in triplicate,recording individual every 15 d,...

The tropical gar (Atractosteus tropicus) is an economically and socially important freshwater fish species from southeastern Mexico, with high aquaculture potential. This study determined the expression of acetyl-CoA carboxylase (ACC1), fatty acid synthase (FAS), carnitine palmitoyl transferase 1 (CPT1C) in several tissues adult specimens, as well early ontogeny stages gar. Partial sequences all genes were obtained for brain, liver, muscle, mesenteric adipose, kidney, testis, gill, heart...

The present research was focused to characterize the digestive proteases in Macrobrachium carcinus adults using biochemical and electrophoretic techniques.Our results showed that alkaline proteolytic activity from males females did not show significant differences (P > 0.05) between them, optimum pH for is 8, very stable changes (8 10).The temperature 45ºC 25 45ºC.The totally inhibited with phenylmethylsulfonyl fluoride (PMSF), additionally inhibition trypsin soybean inhibitor 1 (SBT1)...

El diseño de dietas con base en la fisiología digestiva, así como un adecuado esquema alimentación, per- miten disminución del canibalismo y el incremento supervivencia etapa larvaria peces. Por lo anterior, objetivo fue evaluar crecimiento, larvicultura pejelagarto (Atractosteus tropicus Gill) bajo cuatro esquemas alimentación: CT (co-alimentación nauplio Artemia por 10 días dieta comercial trucha), T1 (alimentación trucha desde apertura boca), T2 nau- plio Artemiay diseñada para larvas A....

Supplementary fructooligosaccharides (FOS) were evaluated on growth, survival, gut morphology, digestive enzyme activity and expression of intestinal barrier genes in tropical gar (Atractosteus tropicus). Four treatments designed to include FOS (5, 10, 15 20 g/Kg) compared with a control (0 the current commercial trout diet. Ten fish stocked (0.25 ± 0.01 g 4.2 0.4 cm total length) per experimental unit by triplicate 45-day experiment. Fish fed 5 10 g/Kg had highest average weight length....

Yellowtail snapper (Ocyurus chrysurus) is one of the most important Lutjanids species in Caribbean due to its great importance recreational and commercial fishing activities. Studies related digestive physiology are essential improve survival after hatching as high mortalities have been reported during larviculture. The aim this study was determine changes activities alkaline acid proteases, trypsin, chymotrypsin, leucine aminopeptidase, lipase, amylase phosphatase O. chrysurus their initial...

Specimens of the uncommon luminous flying squid Eucleoteuthis luminosa were collected off west coast Baja California peninsula during 2004, 2005, and 2008. The morphology morphometry adults, juveniles, paralarvae this species, as well oceanographic conditions specimen sampling are described. Adults 1 juvenile in surface waters both day (20.5°C sea temperature (SST); 0.15 mg/m3 0.55 chlorophyll-a (Chl-a), respectively) night (24°C SST, 0.08 Chl-a). Paralarvae between ∼150 m depth mainly (21 ±...