Marine Fish Calendar. 13. Minicoy

A 'Marine Fish Calendar' for Minicoy is presented here based on the .data collected during April, 1984 to March, 1987. Pole and line and surface trolling gears were responsible for about 95.85% and 4.14% respectively of the total fish landed; catch by hooks and line was negligible (0.01 %)

Analysis of demersal fish assemblages in selected Philippine fishing grounds

This paper presents the results of analyses of demersal fish assemblages in various fishing grounds in the Philippines. Data from exploratory trawl surveys conducted in 1947 - 49 show that the 24 fishing grounds covered by the survey can be arranged along a gradient of substrate type (i.e. relative coral cover and sediment characteristics). These may be used to determine the species commonly caught in these grounds. A trend of increasing catch rates with decreasing water depth and increasing proportion of mud in the substrate was noted. Data from more recent systematic surveys in Samar Sea (1979 - 80), San Pedro Bay (1994 - 95) and Manila Bay (1992 - 93) were analyzed to examine spatio-temporal patterns in fish assemblages. In all 3 areas, the fish community was characterized by a large number of ubiquitous species, with Leiognathids comprising at least 28% of the total catch. In terms of habitat relations, depth was the primary factor in Samar Sea and San Pedro Bay, where transitions in fish assemblage composition were recognizable at certain depth ranges. In Manila Bay, however, species composition appears to be more related to location (inner versus outer portions of the bay). Analysis of data from five locations (Manila Bay, Tayabas Bay, Sorsogon Bay, Samar Sea and San Pedro Bay) extending from the western to the eastern portions of the country showed similar seasonality, with fish assemblage composition varying slightly during the monsoon season.Fishery resources, Demersal fisheries, Fishery surveys, Biomass, Population density, Shrimp fisheries, Catch/effort, Trawling, Population characteristics, ISEW, Philippines,

Index of Scientific Names

Index of scientific names in Investigations of the Ichthyofauna of Nicaraguan Lakes

Concatenation and Concordance in the Reconstruction of Mouse Lemur Phylogeny: An Empirical Demonstration of the Effect of Allele Sampling in Phylogenetics

The systematics and speciation literature is rich with discussion relating to the potential for gene tree/species tree discordance. Numerous mechanisms have been proposed to generate discordance, including differential selection, longbranch attraction, gene duplication, genetic introgression, and/or incomplete lineage sorting. For speciose clades in which divergence has occurred recently and rapidly, recovering the true species tree can be particularly problematic due to incomplete lineage sorting. Unfortunately, the availability of multilocus or “phylogenomic” data sets does not simply solve the problem, particularly when the data are analyzed with standard concatenation techniques. In our study, we conduct a phylogenetic study for a nearly complete species sample of the dwarf and mouse lemur clade, Cheirogaleidae. Mouse lemurs (genus, Microcebus) have been intensively studied over the past decade for reasons relating to their high level of cryptic species diversity, and although there has been emerging consensus regarding the evolutionary diversity contained within the genus, there is no agreement as to the inter-specific relationships within the group. We attempt to resolve cheirogaleid phylogeny, focusing especially on the mouse lemurs, by employing a large multilocus data set. We compare the results of Bayesian concordance methods with those of standard gene concatenation, finding that though concatenation yields the strongest results as measured by statistical support, these results are found to be highly misleading. By employing an approach where individual alleles are treated as operational taxonomic units, we show that phylogenetic results are substantially influenced by the selection of alleles in the concatenation process. Includes supplementary materials

Index for Marine Fisheries Information Service, Technical and Extension Series, Nos. 51-100(July 1983-October,1989)

Index for Marine Fisheries Information Service, Technical and Extension Serie

Structure and permeability of the egg capsule of the placental Australian sharpnose shark, Rhizoprionodon taylori

Shark placentae are derived from modifications to the fetal yolk sac and the maternal uterine mucosa. In almost all placental sharks, embryonic development occurs in an egg capsule that remains intact for the entire pregnancy, separating the fetal tissues from the maternal tissues at the placental interface. Here, we investigate the structure and permeability of the egg capsules that surround developing embryos of the placental Australian sharpnose shark (Rhizoprionodon taylori) during late pregnancy. The egg capsule is an acellular fibrous structure that is 0.42 ± 0.04 μm thick at the placental interface between the yolk sac and uterine tissues, and 0.67 ± 0.08 μm thick in the paraplacental regions. This is the thinnest egg capsule of any placental shark measured so far, which may increase the diffusion rate of respiratory gases, fetal wastes, water and nutrients between maternal and fetal tissues. Molecules smaller than or equal to ~ 1000 Da can diffuse through the egg capsule, but larger proteins (~ 3000–26,000 Da) cannot. Similar permeability characteristics between the egg capsule of R. taylori and other placental sharks suggest that molecular size is an important determinant of the molecules that can be exchanged between the mother and her embryos during pregnancy

Focus on small scale fisheries: drift gillnet fishery off Cochin, 1981 and 1982

In recent years, the drift gillnet fishery has become one of the fast growing fishing methods in the coastal fishing sector because of its economic viability and selectivity for catching larger pelagics which find ready acceptance and consumer demand in the market. The present report embodies the result of the study carried out on the mechanised drift gillnet fishery off Cochin, the cost-benefits of the operation and the drift gillnet operations are confined to the surface and mid-depth zones at the fishing grounds, a brief review of the hydrographic features of the area during the period 1981 and 1982 is presented here