{"refrec":{"BRefID":6036,"RR":"<b>Van Landtschoote, E.</b> (1986). Ecologisch onderzoek van de visfauna in de kustwateren ter hoogte van de Zwinmonding. MSc Thesis. Rijksuniversiteit Gent. Faculteit Wetenschappen. Laboratorium voor Morfologie en Systematiek der Dieren. Sectie Mariene Biologie: Gent. 109 pp.","BEntID":6036,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". MSc Thesis. Rijksuniversiteit Gent. Faculteit Wetenschappen. Laboratorium voor Morfologie en Systematiek der Dieren. Sectie Mariene Biologie: Gent.  109 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Van Landtschoote, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Van Landtschoote, E.","Englishabstract":"In 1985, there was fishing taking place on a more or less monthly basis, in the shallow sub littoral (3-4 m at low water) of the sandy beach, in front of the nature reserve of “het Zwin”, in the neighbourhood of the Wester Scheldt estuary. With the help of a 1.90 m fine-meshed (10 mm straightened mesh) tree-dredge-net and pulled by a vessel with little profoundness, every morning at low water a known surface was being fished. The fish were immediately benumbed and then fixed, considering the stomach analysis. For the used fishing tools, the net efficiency is known for certain species so that absolute densities of the demersale fish fauna could be calculated. Seeing the limited ability for capture of larger (<120mm) fish, apart from the non-commercial species, juveniles of commercial species were taken into account when calculating. 30 different fish species were caught. Two difficulties arose with the identification. A comparative study of postlarvae and herring-like (Clupeidae) turned out to be necessary because the available literature data were not sufficient for determination. It was found that only counting of the myotomes offers sufficient support to the discrimination herring (<i>Clupea harengus</i>) and sprat (<i>Sprattus sprattus</i>), at least for length classes up to 35 mm. In agreement with Hamerlynck & Janssen (1985) we noted, apart from <i>Pomatoschistus minutus</i> also <i>P. lozanoi</i> in that area. The latter is not being considered separately in certain, even recent, publications. For <i>P. minutus</i>, <i>P. lozanoi</i>, <i>Pleuronectes platessa</i> and <i>Clupea harengus</i> the observations were regularly spread over the course of the year, so to be able to follow the life history of these species. For the two latter species, we only have data of the 0+ and the 1+ year classes. Amongst other, we can deduce that <i>Pleuronectes platessa</i>, with the literature. For some commercially important species, the area has an important function as nursey: <i>Pleuronectes platessa</i>, <i>Solea solea</i>,<i>Limanda limanda</i>, <i>Clupea harengus</i> and <i>Sprattus sprattus</i>. In winter time immigration can be noted from brackish water species, originating from the Zwin and/or the Wester Scheldt: <i>P. microps</i>, <i>Gasterosteus aculeatus</i> and <i>Pungitius pungitius</i>. Two species of sand groundels together (<i>P. minutus</i> and <i>P. lozanoi</i>) reach an average density each year of 1 individual per 2 m<sup>2</sup> in this area. The density of <i>P. lozanoi</i> lies 4x higher than the density of <i>P. minutus</i>. On the second pace we have the plaice (<i>Pleuronectes platessa</i>) with 1 individual per 10 m². Densities of <i>Solea solea</i> and <i>Limanda limanda</i> reach in certain months also high values of 1 ind./ m². The biomass of the most important species was calculated according to the length-axe free dry weight (AFDW) regressions originating from calculated absolute densities. <i>P. platessa</i>, represented in biomasses, the highest value namely 0.8 g AFDW per m² per year. <i>P. minutus</i> and <i>P. lozanoi</i> together reach a value that is half as low. To calculate the production, the classic method of Allen amongst others, turned out not to be suitable for the data that are gathered this way. Only the Crisp (1984) method turned out strong enough to be used on these data. Because the fitting of a grow comparison to the insufficient dataset could not be done in a satisfactory way, it was opted for exponential interpolation of the grow curb, separating the cohorts “the visu”, for the determination of G (the instantaneous growth rate). The production of 0+ <i>P.platessa</i> grind out in the winter of 1984-1985 is being estimated at 0.06 9 AFDW / m² per year. The total yearly consumption of the sandground is and the plaice together is being estimated at 10 g AFDW / m². The latter guarantees 65% of that value. Expressed in energy-units, the two ground species consume together more or less 20 ","AbstractOtherLang":"In 1985 werd ongeveer maandelijks gevist in het ondiep sublittoraal (3-4m bij laag water) van het zandstrand. voor het natuurreservaat \"het Zwin\",in de nabijheid van het Westerschelde-estuarium.Met behulp van een 1.90m boomkor voorzien van een fijnmazig net (10 mm gestrekte maas) en getrokken door een boot met geringe diepgang werd telkens 's morgens rond laag water een gekende oppervlakte bevist. De vissen werden, met het oog op maaganalyses onmiddellijk verdoofd en daarna gefixeerd. Voor het gebruikte vistuig is de netefficientie bekend voor bepaalde soorten zodat absolute densiteiten konden berekend worden van de demersale visfauna. Gezien de beperkte vangbaarheid van grotere (>120 mm) vissen worden naast de niet commerciele soorten enkel juvenielen van commerciele soorten in de berekeningen betrokken. Er werden 30 verschillende vissoorten gevangende identificatie deden zich twee moeilijkheden voor. Een vergelijkende studie van postlarven van haringachtigen (Clupeidae) bleek nodig gezien de beschikbare literatuurgegevens geen voldoening boden in verband met de determinatie. Er werd gevonden dat enkel telling van de myotomen voldoende houvast biedt om de discriminatie haring <i>(Clupea harengus)</i> en sprot (Sprattus sprattus)</i>, tenminste voor de lengteklassen tot 35 mm, In overeenstemming met Hamerlynck & Janssen (1985) stelden we naast <i>Pomatoschistus minutus</i> ook <i>P.lozanoi</i> vast in het gebied. Deze laatste wordt in bepaalde, zelfs recente publicaties niet afzonderlijk behandeld. Voor <i>P. minutus</i>, <i>P. lozanoi</i>, <i>Pleuronectes platessa</i> en <i>Clupea harengus</i> waren de waarnemingen regelmatig verspreid over de loop van het jaar zodat we de levensgeschiedenis van deze soorten kunnen volgen. Voor de 2 laatstgenoemde soorten beschikken we enkel over gegevens van de 0+ en 1+ jaarklassen. Daaruit kon onder andere afgeleid uorden dat <i>Pleuronectes platessa</i>, met de literatuur. Voor enkele commercieel belangrijke soorten heeft het gebied een belangrijke funktie als nursey: <i>Pleuronectes platessa</i>, <i>Solea solea</i>,<i>Limanda limanda</i>,<i>Clupea harengus</i> en <i>Sprattus sprattus</i>. 's Winters stellen we immigratie vast van brakwatersoorten afkomstig uit het Zwin en/of de Westerschelde: <i>P. microps</i>, <i>Gasterosteus aculeatus</i> en <i>Pungitius pungitius</i>.De twee soorten strandgrondels samen <i>(P. minutus</i> en <i>P. lozanoi</i>) bereiken in het gebied een jaarlijkse gemiddelde densiteit van 1 individu per 2 m². De densiteit van <i>P.lozanoi</i> ligt 4 x hoger van <i>P. minutus</i>. Op de tweede plaats komt de schol <i>(Pleuronectes platessa)</i> met 1 individu per 10 m². Densiteiten van <i>Solea solea</i> en <i>Limanda limanda</i> bereiken in bepaalde maanden ook hoge waarden: 1 ind . / m². De biomassa van de belangrijkste soorten werd berekend aan de hand van lengte-asvrij drooggewicht (AFDW) regressies uitgaande van de berekende absolute densiteiten. In biomassa vertegenwoordigt <i>P.platessa</i> de hoogste waarde nl. 0.8 g AFDW per m² per jaar. <i>P. minutus</i> en <i>P.lozanoi</i> samen bereiken een waarde die de helft lager ligt. Om de produktie te berekenen bleek onder andere de klassieke methode van Allen niet geschikt te zijn voor gegevens die op deze manier bekomen worden. Enkel de methode van Crisp (1984) bleek robuust genoeg om toegepast te worden op onze gegevens. Omdat het fitten van een groeivergelijking aan de gebrekkige dataset niet op bevredigende wijze kon gebeuren werd voor de bepaling van G (de instantaneous growth rate) geopteerd voor exponentiele interpolatie van de groeikurve waarbij de cohorten \"de visu\" gescheiden worden. De produktie van 0+ <i>P.platessa</i> uitgeslopen in de winter van 1984-1985 wordt geschat op 0.06 9 AFDW / m² per jaar. De totale jaar1ijkse consumptie voor de strandgronde1s en de schol samen wordt geschat als 10 g AFDW / m². Deze laatste staat in voor 65 % van die waarde. 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