<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 6.4a -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: https://www.novaworks.com -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/cef/2025/cef-2025.xsd#N2Cover" roleURI="http://xbrl.sec.gov/cef/role/N2Cover" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/cef/2025/cef-2025.xsd#N2" roleURI="http://xbrl.sec.gov/cef/role/N2" />
    <link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cef/role/N2" xlink:title="995470 - Disclosure - N-2">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/cef/2025/cef-2025.xsd#cef_ProspectusLineItems" xlink:label="loc_cefProspectusLineItems" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_deiDocumentPeriodEndDate" />
      <link:presentationArc order="1.1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefProspectusLineItems" xlink:to="loc_deiDocumentPeriodEndDate" xlink:type="arc" priority="1" />
    </link:presentationLink>
    <link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cef/role/N2">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_CommonSharesMember" xlink:label="loc_bgxCommonSharesMember" />
      <link:presentationArc order="1000" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_bgxCommonSharesMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_RevolvingCreditsFacilityMember" xlink:label="loc_bgxRevolvingCreditsFacilityMember" />
      <link:presentationArc order="1010" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_bgxRevolvingCreditsFacilityMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_MRPSSeriesAMember" xlink:label="loc_bgxMRPSSeriesAMember" />
      <link:presentationArc order="1020" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_bgxMRPSSeriesAMember" xlink:type="arc" />
    </link:presentationLink>
    <link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cef/role/N2" />
    <link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cef/role/N2" />
    <link:presentationLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cef/role/N2">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/cef/2025/cef-2025.xsd#cef_AllRisksMember" xlink:label="loc_cefAllRisksMember" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_InvestmentAndMarketRiskMember" xlink:label="loc_bgxInvestmentAndMarketRiskMember" />
      <link:presentationArc order="1000" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxInvestmentAndMarketRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_BelowInvestmentGradeOrHighYieldInstrumentsRiskMember" xlink:label="loc_bgxBelowInvestmentGradeOrHighYieldInstrumentsRiskMember" />
      <link:presentationArc order="1010" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxBelowInvestmentGradeOrHighYieldInstrumentsRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_CovenantLiteObligationsRiskMember" xlink:label="loc_bgxCovenantLiteObligationsRiskMember" />
      <link:presentationArc order="1020" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxCovenantLiteObligationsRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_ValuationRiskMember" xlink:label="loc_bgxValuationRiskMember" />
      <link:presentationArc order="1030" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxValuationRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_SwapRiskMember" xlink:label="loc_bgxSwapRiskMember" />
      <link:presentationArc order="1040" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxSwapRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_CreditsRiskMember" xlink:label="loc_bgxCreditsRiskMember" />
      <link:presentationArc order="1050" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxCreditsRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_SystematicStrategiesRelatedToBondInvestmentsRiskMember" xlink:label="loc_bgxSystematicStrategiesRelatedToBondInvestmentsRiskMember" />
      <link:presentationArc order="1060" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxSystematicStrategiesRelatedToBondInvestmentsRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_ForceMajeureRiskMember" xlink:label="loc_bgxForceMajeureRiskMember" />
      <link:presentationArc order="1070" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxForceMajeureRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_EpidemicAndPandemicRiskMember" xlink:label="loc_bgxEpidemicAndPandemicRiskMember" />
      <link:presentationArc order="1080" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxEpidemicAndPandemicRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_FraudMember" xlink:label="loc_bgxFraudMember" />
      <link:presentationArc order="1090" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxFraudMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_MarketDisruptionAndGeopoliticalRiskMember" xlink:label="loc_bgxMarketDisruptionAndGeopoliticalRiskMember" />
      <link:presentationArc order="1100" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxMarketDisruptionAndGeopoliticalRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_LenderLiabilityRiskMember" xlink:label="loc_bgxLenderLiabilityRiskMember" />
      <link:presentationArc order="1110" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxLenderLiabilityRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_CounterpartyRiskMember" xlink:label="loc_bgxCounterpartyRiskMember" />
      <link:presentationArc order="1120" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxCounterpartyRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_PotentialConflictsOfInterestRiskMember" xlink:label="loc_bgxPotentialConflictsOfInterestRiskMember" />
      <link:presentationArc order="1130" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxPotentialConflictsOfInterestRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_LimitationsOnTransactionsWithAffiliatesRiskMember" xlink:label="loc_bgxLimitationsOnTransactionsWithAffiliatesRiskMember" />
      <link:presentationArc order="1140" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxLimitationsOnTransactionsWithAffiliatesRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_DependenceOnKeyPersonnelRiskMember" xlink:label="loc_bgxDependenceOnKeyPersonnelRiskMember" />
      <link:presentationArc order="1150" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxDependenceOnKeyPersonnelRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaymentRiskMember" xlink:label="loc_us-gaapPrepaymentRiskMember" />
      <link:presentationArc order="1160" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_us-gaapPrepaymentRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_RepurchaseAgreementsRiskMember" xlink:label="loc_bgxRepurchaseAgreementsRiskMember" />
      <link:presentationArc order="1170" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxRepurchaseAgreementsRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_ReverseRepurchaseAgreementsRiskMember" xlink:label="loc_bgxReverseRepurchaseAgreementsRiskMember" />
      <link:presentationArc order="1180" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxReverseRepurchaseAgreementsRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_InvestmentsInEquitySecuritiesOrWarrantsIncidentalToInvestmentsInFixedIncomeInstrumentsMember" xlink:label="loc_bgxInvestmentsInEquitySecuritiesOrWarrantsIncidentalToInvestmentsInFixedIncomeInstrumentsMember" />
      <link:presentationArc order="1190" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxInvestmentsInEquitySecuritiesOrWarrantsIncidentalToInvestmentsInFixedIncomeInstrumentsMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_InflationDeflationRiskMember" xlink:label="loc_bgxInflationDeflationRiskMember" />
      <link:presentationArc order="1200" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxInflationDeflationRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_USGovernmentDebtSecuritiesRiskMember" xlink:label="loc_bgxUSGovernmentDebtSecuritiesRiskMember" />
      <link:presentationArc order="1210" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxUSGovernmentDebtSecuritiesRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_CyberSecurityRiskAndIdentityTheftRisksMember" xlink:label="loc_bgxCyberSecurityRiskAndIdentityTheftRisksMember" />
      <link:presentationArc order="1220" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxCyberSecurityRiskAndIdentityTheftRisksMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_PortfolioTurnoverRiskMember" xlink:label="loc_bgxPortfolioTurnoverRiskMember" />
      <link:presentationArc order="1230" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxPortfolioTurnoverRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_GovernmentInterventionInTheFinancialMarketsMember" xlink:label="loc_bgxGovernmentInterventionInTheFinancialMarketsMember" />
      <link:presentationArc order="1240" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxGovernmentInterventionInTheFinancialMarketsMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_InflationRiskMember" xlink:label="loc_bgxInflationRiskMember" />
      <link:presentationArc order="1250" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxInflationRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_RegulatoryRiskMember" xlink:label="loc_bgxRegulatoryRiskMember" />
      <link:presentationArc order="1260" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxRegulatoryRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_DerivativesRiskMember" xlink:label="loc_bgxDerivativesRiskMember" />
      <link:presentationArc order="1270" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxDerivativesRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_SecuredLoansRiskMember" xlink:label="loc_bgxSecuredLoansRiskMember" />
      <link:presentationArc order="1280" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxSecuredLoansRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_FixedIncomeInstrumentsRiskMember" xlink:label="loc_bgxFixedIncomeInstrumentsRiskMember" />
      <link:presentationArc order="1290" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxFixedIncomeInstrumentsRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_UnsecuredLoansRiskMember" xlink:label="loc_bgxUnsecuredLoansRiskMember" />
      <link:presentationArc order="1300" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxUnsecuredLoansRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_ShortSellingRiskMember" xlink:label="loc_bgxShortSellingRiskMember" />
      <link:presentationArc order="1310" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxShortSellingRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_StructuredProductsRiskMember" xlink:label="loc_bgxStructuredProductsRiskMember" />
      <link:presentationArc order="1320" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxStructuredProductsRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_LiquidityRiskMember" xlink:label="loc_bgxLiquidityRiskMember" />
      <link:presentationArc order="1330" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxLiquidityRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_LeverageRiskMember" xlink:label="loc_bgxLeverageRiskMember" />
      <link:presentationArc order="1340" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxLeverageRiskMember" xlink:type="arc" />
      <link:loc xlink:type="locator" xlink:href="bgx-20251231.xsd#bgx_ForeignCurrencyRiskMember" xlink:label="loc_bgxForeignCurrencyRiskMember" />
      <link:presentationArc order="1350" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_cefAllRisksMember" xlink:to="loc_bgxForeignCurrencyRiskMember" xlink:type="arc" />
    </link:presentationLink>
</link:linkbase>
